Complete Point-of-Use Reverse Osmosis System Maintenance Guide
Point-of-use (POU) reverse osmosis systems, including under-sink and countertop RO units, deliver pure, great-tasting water right where you need it — at your kitchen sink. These compact water filtration systems are ideal for homeowners seeking effective contaminant removal without the expense or complexity of whole-house setups.
In this comprehensive maintenance guide, we'll walk you through everything you need to know to keep your Crystal Quest® point-of-use reverse osmosis system running efficiently. From routine filter replacements to cleaning tips, you'll learn how to maximize performance, extend your system's lifespan, and enjoy clean, refreshing water every day.
Key Takeaways: At a Glance
Simple Single-Membrane Design
Most point-of-use reverse osmosis systems feature a single RO membrane, which makes replacement easier and more affordable compared to complex multi-membrane whole-house systems.
Pressurized Storage Tank Requires Special Care
The compact pressurized storage tank uses air pressure (typically 7-10 PSI) to deliver purified water quickly. It requires regular pressure checks and periodic cleaning to maintain optimal function.
DIY-Friendly Maintenance
Routine maintenance tasks, including filter changes and tank care, usually take between 30 to 60 minutes and require only basic household tools—ideal for homeowners who prefer a do-it-yourself approach.
Complete Filter Set Replacement Recommended
To ensure peak water quality and system longevity, replace all filters—including pre-filters, the RO membrane, and post-filters—as a complete set every 2 to 4 years.
Point-of-Use RO System Quick Facts
Daily Production
50-100 GPD
Gallons per day
Storage Capacity
2-4 gallons
Pressurized tank
Installation
Under-sink
Kitchen location
Understanding Your Point-of-Use Reverse Osmosis System
Point-of-use (POU) reverse osmosis systems are designed with convenience and simplicity in mind. Unlike whole-house filtration systems, they focus on providing pure, safe water specifically for drinking and cooking. Here's what sets them apart:
- Compact Design: Fits neatly under your kitchen sink with minimal space needed.
- Single RO Membrane: A high-quality membrane removes 95–99% of common contaminants for clean water.
- Pressurized Storage Tank: A bladder-style tank typically stores 2 to 4 gallons of purified water, ready for immediate use.
- Dedicated Faucet: A separate faucet at your sink delivers purified water on demand, separate from your regular tap.
- Automatic Shut-Off Valve: Stops the system from producing water once the storage tank is full, conserving water and energy.
- Simple Operation: Minimal electronics or programming means easy, reliable use without complicated controls.
Common Components of a Point-of-Use RO System
Crystal Quest undersink reverse osmosis systems, as well as countertop ROs, come equipped with the following:
- Carbon Block Pre-Filter: A high-efficiency 0.5 micron coconut-based filter that removes chlorine, improves water taste and odor, while also trapping dirt, rust, and particles down to 0.5 microns to protect downstream components.
- SMART Pre-Filter: A multimedia cartridge containing catalytic and coconut GAC, two types of ERA, and ion exchange media to filter out organic compounds like chlorine, chloramine, pesticides, VOCs, and more.
- Ultrafiltration (UF) Pre-Filter: An advanced hollow fiber membrane that provides additional filtration before the RO membrane, removing bacteria and fine particles.
- Specialty Pre-Filters (Optional): Crystal Quest offers advanced specialty filters that can be added before the RO membrane to target specific contaminants such as nitrates, arsenic, and fluoride for enhanced water safety.
- RO Membrane: The core filtration component that removes dissolved solids, heavy metals, and many harmful contaminants.
- Post-Carbon or SMART Filter: A final polishing filter to enhance water taste and freshness.
- Additional Post-Filtration (Optional): Some point-of-use systems, such as the Crystal Quest Thunder Undersink 4000 Series, come equipped with advanced post-filtration options like UV water sterilizers or remineralizing filters to provide extra protection and improved water quality.
- Storage Tank: A pressurized bladder tank that holds purified water for on-demand dispensing.
Looking for a Different RO Maintenance Guide?
Browse alternative guides for your reverse osmosis system
Point-of-Use Reverse Osmosis Maintenance Schedule
For typical residential point-of-use (POU) RO systems producing between 50 to 100 gallons per day, following a regular maintenance schedule ensures consistent water quality and system longevity. Below is a recommended guide outlining key maintenance tasks, how often to perform them, and the approximate time and difficulty involved.
| Maintenance Task | Frequency | Time Required | Difficulty |
|---|---|---|---|
|
Visual Inspection Check for leaks, unusual sounds |
Monthly | 5 minutes | Easy |
|
Water Quality Test TDS measurement comparing RO vs. tap water |
Monthly | 5 minutes | Easy |
|
System Sanitization Clean housings and tubing |
Annually | 1 hour | Moderate |
|
Storage Tank Cleaning Sanitize and check air pressure |
Every 2 years | 45 minutes | Moderate |
|
Complete Filter Set Replacement All filters including RO membrane |
Every 2–4 years (average 3 years) |
1 hour | Easy |
|
Replace Remineralizer If system includes remineralization |
With filter set replacement | Included above | Easy |
Monthly Maintenance: 5-Minute System Check
Performing a quick monthly inspection helps you catch potential issues early and ensures your point-of-use (POU) reverse osmosis system consistently delivers pure, great-tasting water. Here's what to check during your routine system check:
Visual Inspection Under the Sink
Open your cabinet and look carefully for any signs of leaks or moisture. Water droplets, puddles, or mineral deposits around fittings are red flags that need immediate attention. Also, ensure all tubing connections are tight and tubing is free of kinks or damage—small bends can reduce water flow and stress your system components.
Listen to Your System
Your RO system should run quietly with only occasional gentle noises while filling the storage tank. Constant running water sounds, loud gurgling, or unusual pump noises usually indicate a problem. Continuous running often points to a faulty shut-off valve, while gurgling sounds suggest air trapped in the system or drain line issues.
Test Water Flow Rate
Turn on your RO faucet and observe the water flow. It should be steady without sputtering or air bubbles. Time how long it takes to fill a one-gallon container—it should take roughly 2 to 4 minutes. A slower flow rate can mean clogged filters or low tank pressure, while sputtering usually signals air in the system.
Check Water Quality with a TDS Meter
Testing your water quality regularly is one of the best ways to monitor how well your RO system is performing. By measuring the Total Dissolved Solids (TDS) in both your tap water and RO water, you can calculate your system's rejection rate — a key indicator of filtration effectiveness. Tracking this number over time helps you spot when filters or membranes may need replacement before you notice a drop in water taste or safety.
How to Calculate RO Rejection Rate
Use a Total Dissolved Solids (TDS) meter to test both your tap water and purified RO water. The rejection rate tells you how effectively your reverse osmosis system is removing dissolved solids.
Calculate your system's rejection rate with this formula:
Example: Let's assume you are testing your water and your tap water reads 200 ppm of TDS, and your RO water reads 10 ppm. Here's how to calculate your system's rejection rate:
Step 1: Subtract RO TDS from Tap TDS. Take your tap water reading (200 ppm) and subtract your RO water reading (10 ppm), which gives you 190.
Step 2: Divide by Tap TDS. Take the result from Step 1 (190) and divide it by your tap water TDS (200). This gives you 0.95.
Step 3: Multiply by 100 to get percentage. Take your decimal result (0.95) and multiply by 100 to convert it to a percentage.
Final Result: Your RO system has a 95% rejection rate, meaning it removes 95% of dissolved solids from your water—an excellent performance.
Taste and Odor Assessment
Finally, taste your RO water. It should be clean, fresh, and pure—similar to high-quality bottled water. Any chlorine taste, metallic flavor, or unusual odors may indicate filter issues. Trust your senses; they often catch problems before instruments do.
Keep a simple log of your monthly TDS readings. A gradual increase over time can signal membrane wear, while sudden spikes may indicate filter failures or system bypass leaks.
Complete Filter Set Replacement Guide
For point-of-use (POU) reverse osmosis systems, we recommend replacing all filters—including pre-filters, the RO membrane, and post-filters—together as a complete set every 2 to 4 years. This approach ensures optimal system performance, simplifies maintenance, and maximizes membrane life.
Why Replace All Filters Together?
- Optimal Performance: Fresh pre-filters protect your new membrane from contaminants right from day one.
- Simplified Scheduling: One replacement cycle instead of juggling multiple filter change dates.
- Cost Savings: Purchasing filter sets typically costs less than buying individual components, especially during Crystal Quest sales events.
- Maximum Membrane Life: New pre-filters help the membrane last the full 2–4 years without premature fouling.
- Subscription Benefits: Save 5% on all replacement filters with Crystal Quest's convenient auto-renewal subscription plans.
When to Replace Your Complete Filter Set
- Time-Based: Every 2 to 4 years (average 3 years), regardless of how the filters look.
- Performance-Based: When your TDS rejection rate falls below 90%.
- Flow-Based: When you notice a significant decrease in water flow.
- Taste-Based: When your water develops off-flavors or unusual tastes.
Step-by-Step Complete Filter Set Replacement
Replacing your complete filter set every 2 to 4 years is a straightforward process that takes about an hour. Follow these steps for proper maintenance:
Step 1: Prepare Your System
Turn off the cold water supply valve under your sink. Close the tank valve (usually a blue ball valve on top of the storage tank). Open your RO faucet to release any pressure—water will flow for a few seconds then stop.
Step 2: Remove Filter Housings
Use the plastic filter wrench that came with your system to unscrew each filter housing by turning counterclockwise. Place a bowl underneath to catch any water spillage. Remove all housings, including the membrane housing—you are replacing everything as a complete set.
Step 3: Install New Filter Set
Dispose of old filters properly according to local regulations. Remove plastic wrapping from your new filters. Install each filter in the correct order: sediment filter first, then carbon pre-filter, RO membrane, and finally the post-carbon filter. Follow flow direction arrows on each component carefully; installing filters backward can damage your system.
For detailed, step-by-step instructions on changing the pre-filters and post-filters, see our How to Replace RO Pre- and Post-Filters Guide.
For a comprehensive walkthrough on replacing the RO membrane, visit our How to Replace RO Membrane Guide.
Step 4: Clean and Inspect Housings
While housings are open, wipe interiors with a clean, damp cloth. Check all O-rings for cracks, dryness, or damage. Apply a thin layer of food-grade silicone lubricant to each O-ring to ensure a tight seal and ease future filter changes.
Step 5: Reassemble Your System
Screw each housing back on by hand until snug, then tighten with the filter wrench about 1/4 turn. Avoid overtightening, which can crack the housings. Ensure all O-rings are properly seated before tightening.
Step 6: Flush Your New Filters
Slowly turn on the water supply and check for leaks. Open the tank valve and let the system fill. Once full, flush 2–3 full tanks of water before drinking. This flushes out carbon fines from the new filters and any preservatives from the new membrane. Your system is now ready for another 2 to 4 years of pure water production.
Filter Replacement Order and Optional Filters
Always replace your filters in the correct order to ensure proper system function and avoid damage:
Standard Replacement Sequence:
Sediment → Carbon → RO Membrane → Post-Carbon → Remineralizer (if applicable)
If your system includes optional specialty filters and/or a UV sterilizer, the typical replacement sequence is:
Extended Replacement Sequence:
Sediment → Carbon → Specialty Filter (Optional) → RO Membrane → Post-Carbon → Remineralizer → UV Sterilizer (Optional)
Explanation:
- Specialty filters such as arsenic, nitrate, or fluoride removal filters are usually installed before the RO membrane to target specific contaminants effectively.
- The UV sterilizer, if included, is installed last, after all filtration stages, to disinfect water immediately before it reaches your faucet.
- Always follow the manufacturer's instructions regarding maintenance and replacement schedules for any optional filters.
Pro Tip
Many manufacturers recommend changing filters and membranes together every 2 to 4 years in POU systems. This maximizes membrane lifespan by providing fresh pre-filters and maintains optimal system performance throughout the replacement cycle.
Storage Tank Maintenance
Your point-of-use (POU) reverse osmosis system's pressurized storage tank requires regular maintenance to ensure proper operation and maintain water quality.
Understanding Your Storage Tank
Most POU systems use a diaphragm or bladder-style tank that separates the water from the air pressure inside. This air pressure—typically between 7 and 10 PSI when the tank is empty—pushes water to your faucet when you open it.
Annual Tank Maintenance
Performing simple maintenance once a year helps keep your storage tank functioning properly and ensures strong water flow.
Check and Adjust Tank Pressure
- Turn off the tank valve and drain the tank completely by opening your RO faucet.
- Use a tire pressure gauge to check the air pressure at the tank's Schrader valve (usually located on the side or bottom).
- The ideal empty tank pressure is between 7 and 10 PSI.
- If pressure is too low, add air using a bicycle pump or air compressor.
- Too much pressure can prevent the tank from filling fully, while too little pressure can cause weak water flow.
Clean Tank Exterior
While checking pressure, wipe down the tank's exterior with a damp cloth. Inspect all fittings for signs of corrosion, cracks, or damage. Ensure the tank sits level and stable, as a wobbly tank can stress connections and cause leaks.
Sanitize Tank Interior
Sanitize your storage tank annually or at least every two years to prevent bacterial growth and maintain water quality. For detailed step-by-step instructions on tank sanitization, see the Tank Sanitization section under System Sanitization Procedure below.
Test Tank Performance
After completing maintenance, refill the tank and check the water flow at your faucet. The flow should be strong and steady without sputtering or air bubbles. If flow is weak despite proper air pressure, the tank's bladder may be damaged and require replacement.
If your tank pressure won't hold or water flow remains weak after maintenance, the internal bladder may be compromised. Replacement tanks typically cost between $40 and $80 and can last 5 to 10 years with proper care.
System Sanitization Procedure
Regular system sanitization is essential to eliminate bacteria and biofilm buildup, ensuring your point-of-use (POU) reverse osmosis system delivers safe, fresh-tasting water.
When to Sanitize
Sanitize your RO system:
- Annually as preventive maintenance
- When replacing the RO membrane
- After any plumbing work or repairs
- If your water develops unusual tastes or odors
- Following extended periods of non-use (such as vacations)
Complete Sanitization Process
Follow these steps carefully to sanitize your entire RO system effectively:
Step 1: Prepare Your System
Turn off both the water supply and tank valve. Remove all filters and the RO membrane from their housings—you will sanitize the empty system. Drain the storage tank completely through your RO faucet to ensure sanitizer reaches all system components.
Step 2: Mix Sanitizing Solution
Prepare your sanitizer by mixing 2 tablespoons of unscented household bleach with 1 gallon of clean water. Avoid scented bleach or products with additives, as these can damage your system or leave residues. Alternatively, hydrogen peroxide-based sanitizers formulated for water systems may be used.
Step 3: Apply Sanitizer to System
Pour the sanitizing solution into the first filter housing. Reassemble all empty housings (without filters) and briefly turn on the water supply to fill the system with sanitizer. This ensures the solution circulates through all tubing and components.
Step 4: Sanitize the Storage Tank
Add 2 tablespoons of sanitizing solution directly to the tank valve. Open the tank valve to allow the tank to fill partially. If possible, gently rock the tank to ensure the sanitizer coats all interior surfaces.
Step 5: Allow Contact Time
Let the sanitizer sit in the system for 60 minutes. This contact time is essential to kill bacteria and remove biofilm. Do not exceed 2 hours, as prolonged exposure to bleach can damage system components.
Step 6: Flush and Reassemble
Drain the entire system through your RO faucet. Rinse all housings thoroughly with clean water. Install your new filter set and membrane, then flush the reassembled system for at least 30 minutes. Test the water for chlorine odor—continue flushing until the water is odor-free and tastes fresh.
Tank Sanitization
If you only need to sanitize your storage tank (recommended annually), follow these specific steps:
Prepare: Turn off the tank valve and drain the tank completely through your RO faucet.
Add Sanitizer: Mix 1-2 teaspoons of unscented bleach with 1 gallon of water. Add this solution through the tank valve and fill the tank about one-third full.
Soak: Let the bleach solution sit inside the tank for 30 minutes.
Drain and Flush: Drain the tank completely, then flush thoroughly with clean water. Repeat this process 2-3 times until no chlorine smell remains.
Safety Tip: Always wear gloves and ensure proper ventilation when handling bleach.
For a detailed, step-by-step cleaning process for both bladder and atmospheric tanks, visit our full guide: How to Clean a Reverse Osmosis Storage Tank.
Troubleshooting Common POU RO Problems
Point-of-use reverse osmosis systems may encounter specific issues that are generally easy to diagnose and fix. Use this troubleshooting guide to identify common problems, their likely causes, and recommended solutions:
| Problem | Likely Causes | Solutions |
|---|---|---|
| No Water from RO Faucet | Tank valve closed, empty tank, feed water off | Check tank valve position, verify tank pressure, ensure feed water is on |
| Very Slow Water Flow | Low tank pressure, clogged filters, kinked tubing | Check tank pressure (7–10 PSI), replace filters, inspect tubing for kinks |
| Water Tastes Bad | Old carbon filters, bacterial growth, old membrane | Replace carbon filters, sanitize system, test membrane performance |
| System Won't Stop Running | Faulty auto shut-off valve, membrane failure, tank pressure loss | Replace shut-off valve, check membrane, verify tank pressure |
| High TDS in RO Water | Membrane failure, incorrect installation, bypass valve open | Test membrane rejection rate, verify connections, check all valves |
| Gurgling or Air in Water | Air trapped after maintenance, drain line issues | Normal after filter changes (allow 24 hours), check drain connection |
| Leaking Under Sink | Loose fittings, damaged O-rings, overtightened housings | Tighten connections, replace O-rings, inspect housings for cracks |
| Frequent Filter Replacement | Poor feed water quality, incorrect filter sequence | Test feed water quality, consider pre-treatment options, verify filter order |
Remineralizer Maintenance
If your point-of-use (POU) reverse osmosis system includes a remineralizer filter, it requires specific care to maintain water quality and taste.
Understanding Remineralization
Remineralizer cartridges add beneficial minerals such as calcium and magnesium back into RO water. This process improves the water's taste and slightly raises its pH, making it more alkaline. Remineralizers are especially popular for drinking water applications where balanced mineral content is desired.
Remineralizer Maintenance Schedule
- Replacement Frequency: Every 12 to 18 months
- Performance Testing: Monitor water pH monthly; ideal range is 7.5 to 8.5
- Taste Testing: Water should taste clean and slightly alkaline
- TDS Monitoring: Expect a slight increase in Total Dissolved Solids (TDS) of 50 to 150 ppm, which is normal
Signs Remineralizer Needs Replacement
- pH drops below 7.0, indicating acidic water
- Water tastes flat or overly pure
- Visible depletion of mineral media if the housing is transparent
Seasonal and Vacation Maintenance
Point-of-use (POU) reverse osmosis systems require special care during extended absences and seasonal temperature changes to maintain water quality and protect system components.
Before Vacation (1+ Weeks Away)
If you plan to be away for a week or more, follow these simple steps to safeguard your RO system:
- Use up the water in your storage tank and allow it to refill with fresh water.
- Turn off the feed water valve to prevent unnecessary system cycling while you're away.
- For absences longer than four weeks, consider draining the entire system to avoid stagnant water buildup and bacterial growth.
After Vacation Return
When you come back, turn the feed water valve back on and allow the system to refill completely. Be sure to drain the first tank of water entirely to flush out any stagnant water. Test the water quality with your TDS meter and taste it before resuming normal use. If your absence was longer than a month, performing a full system sanitization is recommended to ensure optimal water quality.
Winter Freeze Protection
Keeping your RO system in an environment above freezing (32°F / 0°C) is critical to prevent damage. Insulate any exposed tubing, especially in unheated or cold areas. In extremely cold climates, installing heat tape can provide extra protection. If freezing does occur, thaw the system slowly and inspect thoroughly for leaks or damage before resuming use.
Cost Analysis: DIY vs Professional Service
Point-of-use (POU) reverse osmosis systems are designed for DIY maintenance, offering significant cost savings compared to professional servicing.
| Maintenance Item | DIY Cost | Professional Cost | Annual Frequency | DIY Savings |
|---|---|---|---|---|
| Complete Filter Set Replacement | $120-180 | $300-450 | 0.33x per year | $60-90 |
| System Sanitization | $5 | $75-125 | 1x per year | $70-120 |
| Tank Maintenance | $0-5 | $50-100 | 0.5x per year | $25-50 |
Total Estimated Annual DIY Savings: $155–260
Subscribe to Crystal Quest's automatic filter delivery for 5% savings on all replacements. Watch for seasonal sales and promotions throughout the year for additional discounts. Keep spare filters on hand so you never delay replacement—proper maintenance extends system life and saves money long-term.
When to Call a Professional
While point-of-use (POU) reverse osmosis systems are designed for DIY maintenance, certain situations require professional expertise:
- Initial Installation: Complex plumbing connections and drain hookups.
- Major Leaks: Extensive water damage or structural issues needing repair.
- Electrical Problems: Troubleshooting pumps, monitors, or electronic components.
- Persistent Water Quality Issues: Problems that persist despite proper maintenance and troubleshooting.
- System Upgrades: Adding filtration stages or changing system configurations.
- Warranty Repairs: Issues covered under manufacturer warranty requiring authorized service.
Maximizing Your POU RO Investment
With proper care and maintenance, your point-of-use RO system can provide pure, healthy water for 15 to 20 years while saving thousands compared to bottled water.
Long-Term Benefits Include:
- Health Protection: Consistent removal of 95–99% of contaminants.
- Cost Savings: Approximately $0.10–0.20 per gallon versus $1.00+ for bottled water.
- Convenience: Pure water on demand without the hassle of storage or delivery.
- Environmental Impact: Eliminates thousands of plastic bottles from landfills.
- Taste Quality: Water quality superior to many bottled brands.
- Reliability: Consistent purity regardless of municipal water fluctuations.
Conclusion: Simple Maintenance for Pure Water
Point-of-use reverse osmosis systems offer an ideal balance of exceptional water quality and easy maintenance. By following this comprehensive guide—including monthly inspections, annual filter replacements, and regular sanitization—you ensure your family enjoys fresh, great-tasting water while protecting your investment.
Remember, POU systems reward consistent care with reliable, long-lasting performance. Stay proactive with filter changes, monitor your water quality regularly, and promptly address any issues. Your diligence will result in years of pure water and worry-free operation.
Ready for Pure Water at Your Kitchen Sink?
Discover Crystal Quest® point-of-use RO systems designed for easy maintenance and exceptional performance. From compact under-sink units to convenient countertop models, we have the perfect solution for your kitchen.
Easy DIY installation • Long filter lifespan • Trusted for 30+ years
Essential POU RO Maintenance Products
Keep your point-of-use system performing like new with these genuine Crystal Quest® replacement components designed for easy DIY maintenance.
Replacement Pre-Filters
2.5" (2-7/8") x 10" (9-3/4") Smart and carbon block filters.
Shop Replacements
Frequently Asked Questions About POU RO Maintenance
How often should I change my under-sink RO filters?
For point-of-use (under-sink) systems, we recommend replacing all filters (pre-filters, RO membrane, and post-filters) together as a complete set every 2-4 years (average 3 years). This is different from whole house systems where filters and membranes have separate schedules. This all-at-once approach ensures optimal performance and simplifies maintenance—no need to track individual filter dates.
Why is my RO water production slow?
Slow production usually indicates clogged pre-filters, low storage tank pressure (should be 7-10 PSI when empty), or a fouled membrane. Check tank pressure first, then consider complete filter set replacement if it's been 2+ years since last change. Cold water also slows production—normal in winter months.
Can I clean and reuse RO filters?
No, sediment, carbon, and post-carbon filters cannot be cleaned and must be replaced. RO membranes can sometimes be cleaned, but since we recommend complete filter set replacement every 2-4 years for POU systems, individual membrane cleaning is typically not necessary.
How do I know when to replace my complete filter set?
Test water with a TDS meter monthly. If TDS rejection drops below 90%, water production slows significantly, or it's been 3+ years since last replacement, install a complete new filter set. Sudden taste changes or increased drain flow also indicate it's time for replacement.
What causes my RO system to keep running constantly?
Constant operation usually means the auto shut-off valve is faulty, storage tank pressure is low, or the membrane has failed. Check tank pressure first (7-10 PSI empty), then test membrane performance. Replace the shut-off valve if other components check out.
Is it normal for RO water to have some TDS?
Yes, quality RO systems typically produce water with 5-50 TDS (90-98% rejection). Zero TDS is unnecessary and may indicate an overly aggressive system. Good performance ranges: municipal water 90-95% rejection, well water 85-90% rejection due to dissolved minerals.
Should I add a remineralizer to my RO system?
Remineralizers improve taste and add beneficial minerals but aren't necessary for safety. They're recommended if you prefer the taste of spring water, want slightly alkaline water (pH 7.5-8.5), or are concerned about the "flat" taste of pure RO water. They add $20-40 to annual maintenance costs.
How do I maintain proper storage tank pressure?
Check tank pressure annually when empty using a tire pressure gauge on the Schrader valve. Maintain 7-10 PSI—too low causes weak flow, too high prevents tank filling. Add air with a bicycle pump as needed. If pressure won't hold, the internal bladder may need replacement.
Can I install additional stages to my POU system?
Yes, most systems can accommodate additional filters like UV sterilizers, pH adjustment, or specialized contaminant removal stages. However, each addition reduces flow rate and requires additional maintenance. Consult your system manual or manufacturer for compatibility.
What tools do I need for DIY maintenance?
Basic maintenance requires only a filter housing wrench (usually included), TDS meter ($15-25), food-grade sanitizer, and basic hand tools. Optional: tire pressure gauge for tank maintenance, tubing cutter for repairs, and Teflon tape for connections. Most maintenance takes 30-60 minutes.
