Single Nitrate Under Sink Water Filter System - Under Sink Water Filters - Crystal Quest Double Nitrate Under Sink Water Filter System - Under Sink Water Filters - Crystal Quest Nitrate Under Sink Water Filter System - Under Sink Water Filters - Crystal Quest
Single Nitrate Under Sink Water Filter System - Under Sink Water Filters - Crystal Quest

Nitrate Under Sink Water Filter System

5 reviews |


Recommended Leak Detector/Flood-Prevention Valve : Due to numerous unpredictable circumstances including installation errors, flood damage is subject to occur without a leak-detector valve. Our recommended leak detector/flood-prevention valve will allow the water system to be flood-proof.


Our Nitrate Under Sink Water Filter System reduces or removes contaminants such as Nitrate, chlorine & heavy metals from tap water to offer the freshest taste to you. The perfect solution for any household. It is quick and easy to install and use, attractive, convenient, and effectively removes many contaminants from water while increasing alkalinity & oxygenation.

This solid-state water filter uses the latest technologies that blend the adsorption capabilities of coconut shell activated carbon with Eagle Redox Alloy® and more.

  • Installs neatly under the sink.
  • Comes with a beautiful faucet and all necessary installation hardware.

    When considering installation, if current under sink plumbing is hard copper tubing the saddle valve would be used; for flex tubing, the T-valve would be required. While ordering a prompt will require that an installation valve is specified in order to progress through the order entry screen.

    Nitrate Removal Water Filter Cartridge

    Water travels through a Nitrate-selective media. Nitrate reduction is 90% to 95% and breakthrough is not affected by sulfate levels. The capacity is 3000 ppm (parts per million) of nitrates as CaCO3. To determine capacity, first, calculate the ppm of nitrates as CaCO3, then divide that number into 3000 to get the gallons. This cartridge can be regenerated using a sodium chloride brine.*

    Important Note: The nitrate cartridge in this system requires manual salinity regeneration. The regeneration process should be done every 20 to 30 days depending on level of nitrate. The media must be recharged in order to maintain optimum performance. If the media is not regenerated, then the media will exhaust and result in a permeate of 0. The cycle of regeneration will vary based on the influent level of nitrate.

    The process of regeneration involves dissolving salt in water (2-3 cups of salt for every 3-4 cups of water) stir well and soak (you may want to use something to hold the cartridge down) the cartridge for 1-2 hours, then soak the cartridge in tap water for an additional 1-2 hours, rinse with the tap running tap water and reinstall the cartridge. Regeneration is not required before its first use even if the cartridge has been unopened for a period of time.  

    SMART Water Filter Cartridge

    Water flows through a bed of media made of a special high-purity alloy blend of two dissimilar metals - copper and zinc (ERA-6500, ERA-9500). ERA-6500 and ERA-9500 are major advancements in water treatment technology that works on the electrochemical and spontaneous-oxidation-reduction (Eagle Redox Alloy®) principles. Chlorine is instantaneously and almost inexhaustibly oxidized.

    Water flows through ion exchange resins, reducing heavy metals such as lead, copper, aluminum, and water hardness.

    Water flows through granulated activated carbon (GAC). GAC is universally recognized and widely used as an effective adsorbent for a wide variety of organic contaminants, such as chlorine, chemicals linked to cancer (THM's, benzene) pesticides, herbicides, insecticides, volatile organic compounds (VOC's), PCB's, MTBE's and hundreds of other chemical contaminants that may be present in water causing bad taste and odors in your drinking water.

    All Crystal Quest® GAC is a mixed blend of coconut shell and catalytic GAC to address both chlorine, chloramines, and these byproducts.

    Carbon Block Water Filter Cartridge

    Water travels through a 5-micron solid carbon cartridge for removing volatile organic carbon compounds (VOCs), insecticides, pesticides, and industrial solvents and traps particles larger than 5 microns including sediment, silt, sand, and dirt.


    Single 5"L x 14"H x 5"W
    Double 10"L x 14"H x 5"W
    Triple 15"L x 14"H x 5"W

    Operating Specs

    Connection Size 1/4"
    Min Operating Pressure 20 psi (pounds per sq. in.)
    Max Operating Pressure 60 psi (pounds per sq. in.)
    Min Operating Temperature 40° F
    Max Operating Temperature 90° F
    Max Flow Rate 0.5 GPM (gallons per minute)


    Regeneration Process and Capacity of the Nitrate Cartridge




    (<100 PPM HARDNESS)


    2-7/8” x 9-3/4”

    .5 gpm (1.9 lpm)

    5,500 ppm Nitrate*

    Replacement Cartridges

    Which cartridges are in my system?

    Product Name Single Double Triple
    Carbon Block Filter Cartridge (2-7/8" x9-3/4”) CQE-RC-04000 No No Yes
    Nitrate Filter Cartridge (2-7/8" x9-3/4”) CQE-RC-04007 Yes Yes Yes
    SMART Filter Cartridge (2-7/8" x9-3/4”) CQE-RC-04002 No Yes Yes


    Product Manual

    Undersink Manual.pdf

    *A Leak Detector Smart Valve should be purchased/installed to prevent unknown water line conditions such as high water pressure, lack of pressure regulator, water spiking or hammering, or negligent installation.

    Customer Reviews
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    Filter Reviews:
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    John Z.
    United States United States

    Great Products, Great service and staff?

    Excellent product at a fair price. The water filter system manufacturing quality is excellent. More importantly, my interaction with staff over the telephone was wonderful. They all we polite and well trained and service oriented. I communicated with Christina (receptionist; first contact) and Jenny (shipping dept.) and both were very helpful. I can't say enough about their helpfulness and attention to detail on my order. And yes, I will use Crystal Quest products again as needed. They provide quality products, and operate a company with caring and customer first attitudes. This is so refreshing given the current culture of pushing junk out the door, never to be heard from again. Crystal Quest is a relationship based company. Yeah!!


    Crystal Quest

    Thank you for choosing us to help you with your water needs, we're glad to hear that we have been able to help you and thank you so much for your feedback. We love to hear from you!

    JEFF B.
    United States United States

    Excellent customer service

    Just installed, looking forward to safer drinking water. Installation guide could use a bit more clarity regarding the fitting into & out of the unit. Couldn't use either water supply valve connection option but a quick run to Lowes resulted in an alternative solution.

    Lori T.

    Have been using for 2 years, works perfectly, easy to maintain

    I've tested the water twice from my triple cartridge unit for bacteria, nitrates, metals and pesticides at the University of Wisconsin water and environmental analysis lab. My well water has high levels of some of these, but all levels from the Crystal Quest filter have been reduced and test way below safe levels. Thanks Crystal Quest!

    Customer Service
    M-F 9am - 5pm EST (800) 934-0051 or (770) 951-5600