Water Filter CartridgesSKU CQE-RC-04049

SMART + Aluminum Oxide Fluoride Reduction Filter Cartridge

$65.55 Regular price $69.00

Save $3.45 compared with one-time purchase

Reduce fluoride in municipal water with aluminum oxide plus SMART multistage filtration. Carbon and redox media combine with the fluoride treatment in four cartridge sizes with size-specific service flows.

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Size, 2-7/8" x 9-3/4"
Four SMART + Aluminum Oxide Fluoride Reduction Filter cartridges beside matching slim and wide filter housings, with cartridge width × height labeled in inches and the Crystal Quest logo.

Which size SMART + Aluminum Oxide cartridge do I need?

Match the combined SMART + Aluminum Oxide type and size on your system or cartridge sticker.

Cartridge width (diameter) × height → matching Crystal Quest sump.

  • 2⅞″ × 9¾″: Fits 2.5″ × 10″ sumps. Common in countertop, under-sink and replaceable-cartridge inline filters.
  • 2⅞″ × 20″: Fits 2.5″ × 20″ sumps. Common in mini whole-house filters.
  • 4⅝″ × 9¾″: Fits 5″ × 10″ Big Blue sumps. Common in compact whole-house filters.
  • 4⅝″ × 20″: Fits 5″ × 20″ Big Blue sumps. Common in full-size whole-house filters.

Still unsure? Check your order history to confirm your previous cartridge and size.

Filtered water, on repeat.
. Cancel whenever you want

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Made in USA

Shipping

Free shipping on residential orders over $150 within the lower 48 US states.

Order by 3:00 PM Eastern on a business day and most filters, cartridges and smaller items leave our facility that same day. Standard residential systems ship within 1 to 2 business days, and whole house, custom and specialty systems typically within 3. So far in 2026, 95% of our orders have shipped within one business day and 99% within five (based on an internal review of our order records).

Once shipped, standard delivery typically arrives in 3 days to the Southeast, Northeast and Southwest, and in 4 days to the Midwest and the West. Need it sooner? UPS 2nd Day Air and Next Day Air are available at checkout for eligible products. Systems that ship by freight can take longer and may need a delivery appointment.

Lifetime support

Our team answers questions about products, orders, installation, troubleshooting and replacement parts.

Phone: 770-951-5600 or (800) 934-0051

Email: help@crystalquest.com. We reply within 24 to 36 hours.

Live chat during business hours

Hours: Monday to Friday, 9:00 AM to 5:00 PM Eastern. We observe U.S. federal holidays.

Description

SMART + Aluminum Oxide Fluoride Reduction combines dedicated fluoride treatment with multistage filtration media. The cartridge includes aluminum oxide, coconut shell GAC, Eagle Redox Alloy 6500 and 9500, and two filtration pads.

Use the exact aluminum oxide and SMART combination specified for your system. It differs from standalone aluminum oxide and from SMART + Calcium GAC, which uses a different fluoride-media option.

Common questions

What does the combination contain?

The product combines aluminum oxide fluoride treatment with coconut shell GAC, redox alloys and filtration pads.

How is it different from SMART + Calcium GAC?

The fluoride-media type is different. Use the aluminum oxide or calcium GAC combination specified for your treatment system.

Is it an overall 1-micron cartridge?

The cartridge contains two 1-micron filter pads. This describes the pads, rather than an overall cartridge micron rating.

Can I use it for natural fluoride in a well?

The published fluoride application is municipal water. Contact Crystal Quest for a recommendation for well water or other natural sources.