- Water Filters and Filtration Systems   call us about water filters  
View Cart View Cart
  0 item(s)
The Water Filtration store Free shipping on orders over $99 in USA
 Home | Bestsellers | Reminder Service | My Account  Orders  

Water filters really work! You guys are the best!
read more
Home > Replacement Filters → 6-stage Filter Cartridge

6-stage Filter Cartridge

GAC+KDF Filter, 6-stage Water Filtration Cartridge, CQ-RC-PL-10

Click here to view larger image

Brand: Crystal Quest
Dimensions: 10"x2.5"
Weight: 1.5 lb.

In stock

Made in USA

Product SKU Description Price Order
PLUS CQ-RC-PL-10 Filters 10,000 gallons $51.00

ULTRA CQ-RC-UL-10 Filters 20,000 gallons $71.00

ULTIMATE CQ-RC-UM-10 Filters 30,000 gallons $91.00


Standard 10"x2.5" 6-stage GAC KDF Water filter cartridge. Cartridge consists of one-micron filter pad, KDF55, KDF85, GAC, ion exchange resin, and another one-micron pad. Removes hundreds of contaminants from your drinking water. Main workhorse cartridge for Crystal Quest conter top and under sink systems.

How Crystal Quest Multi-Stage Cartridge works

Stage 1: water flows through 1 micron filter pads (1/25,000th of an inch), which remove suspended particles such as silt, sediment, cyst (giardia, cryptosporidium), sand, rust and other non-dissolved matter.
Crystal Quest 6-stage cartridge countertop cutout
Stages 2 and 3: a mix of high purity alloys copper and zync (Eagle Redox Alloy ® 6500 and Eagle Redox Alloy ® 9500). The mix is NSF-cerified, and a major advancement in water treatment technology. It works via electo-chemical and spontaneous-oxidation-reduction (REDOX) principles. Chlorine is instantaneously and almost inexhaustibly oxidized. Tests of Eagle Redox Alloy show 99+% reduction of chlorine past 20,000 gallons of water. In comparison, carbon cartridges of comparable size drop their effectiveness below 90% past 4,000 gallons. Other contaminants are also oxidized, such as iron and hydrogen sulfide. Once contaminants are oxidized into isolluble matter, they attach to the media surface. Heavy metals such as lead, mercury, copper, nickel, chromium, cadmium, aluminum, and other dissolved metals are removed from the water by the electrochemical process. They also get attracted to the surface of the media. Chromium such as hexavalent Chromium IV oxide ( chromium-6 ) will also be removed.

The other advantage of Eagle Redox Alloy is that the media is bacteriostatic, i.e. it prevents bacteria from growing instide the cartridge. This eliminates the need for silver, which is a common additive to carbon filters.

Stage 4: ion exchange resin, which reduces heavy metals such as lead, copper, aluminum, and reduces water hardness.

Stage 5: 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 (99.9%), 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, bad taste, and odors from your drinking water. Because chlorine is removed in stages 2 and 3, carbon capacity isn't exhausted by chlorine and has is available to work more effectively on organic contaminants.

Stage 6: another 1 micron pad.

6-Stage GAC KDF Filter Cartridge specifications

Filtration capacity:
Type Manufacturer's Product Number Replace
(old # CQ-RC-PL-10 )
10,000 gallons (replace every 1-2 years)
(old # CQ-RC-UL-10 )
20,000 gallons (replace every 2-3 years)
(old # CQ-RC-UM-10 )
30,000 gallons (replace every 3-4 years)


The main difference between 3 cartridges is the amount of KDF / Eagle Redox media ( which is a mix of copper and zinc ) used. Less expensive cartridge will have more charcoal and less Redox, and more expensive cartridges will have more Redox.
Filter Size: 10 by 2.5 inches (actual size 9 3/4 x 2 7/8 inch)

Product Rating: (4.25)   # of Ratings: 4   (Only registered customers can rate) Login to Rate

5 stars
4 stars
3 stars
2 stars
1 star
0% 50% 100%

Sort: New to Old RE-SORT COMMENTS:

Customer Reviews : 3 Review(s)
1. dan on 6/15/2015, said:

I use this mounted before the water line goes to the frig and filters it again. I get water from the frig for everything cooking drinking etc.. It tastes great but after a year I recommend replacing because the housing tends to get stagnent and needs a good cleaning. Great product.
  (0 people found this comment helpful, 0 did not)
2. Joel on 6/27/2011, said:

Lasted only about 4-6 weeks in a home with 2 adults. When it was working, before the water flow came to a trickle the water was very good quality. Would not purchase again as it does not last. Expected at least 3 months from it. We have a lot of iron in our water.
  (1 people found this comment helpful, 0 did not)
Comment Reply: Joel, thanks for your comment. Lots of iron should clog these filters, as it tries to remove iron and has a limited capacity for it. When filtering lots of iron with a countertop or under sink system, we recommend filtering through an iron removal cartridge first, which means you need to have a standard 10"x2.5" dual or triple filter system, or purchase a separate 10 inch inline housing for iron filter.

3. Kyle on 2/1/2011, said:

The 6-stage Filter Cartridge works amazing! My mother and I both use this product. It filters our water so good, it taste better than when you buy it bottled at the store. Both my house and my mother’s house are very old. The water piping we have is quite old, and was giving off a metallic taste. After using or water filtered through the cartridge, its taste heavenly! A+++product!
  (1 people found this comment helpful, 0 did not)
: 3 Review(s)

Home | Customer Service | Contact Us | About Us | Affiliates | School & Government | Site Map

Copyright ©2003-2015   Terms & Conditions | Policies | Privacy

Water Quality Association Member
VISA, MasterCard, Discover and Amex accepted PayPal Accepted
GAC+KDF Filter, 6-stage Water Filtration Cartridge