Call Toll-Free: 1-800-277-3458

My Cart:

0 item(s)
You have no items in your shopping cart.

Free Shipping over $39

When we protect your filter purchase with our No Worries Guarantee, we mean it!

No Worries...
  • Your filters are guaranteed to be the right fit!
  • Our products are price match guaranteed!
  • Our customer service team is guaranteed to answer your call!
  • You’re guaranteed to find expert help!

Learn more about our No Worries Guarantee

Undersink Water Filters & Systems

Undersink Water Filters by DiscountFilterStore.com

22 Item(s)

Grid  List 

Set Ascending Direction
  1. PCC-1 Pentek Undersink Filter Replacement Cartridge

    PCC-1 Pentek Undersink Filter Replacement Cartridge

    Fits Pentek standard water filter housings Learn More
    (Retail Price: $53.23 ) $49.99
  2. P1 Pentek Whole House Filter Replacement Cartridge

    P1 Pentek Whole House Filter Replacement Cartridge

    Fits any standard housing that uses 9 3/4-inch x 2 1/2-inch replacement filter cartridges Learn More
    (Retail Price: $7.00 ) $4.99
  3. TO6 OmniFilter Whole House Filter Replacement Cartridge

    TO6-SS2-S06 OmniFilter Whole House Water Filter Replacement Cartridge

    Fits into any brand of whole house water filtration system that accepts filter cartridges sized 9 3/4 x 4 1/2 inches Learn More
    (Retail Price: $24.14 ) $19.99
  4. TO1SS OmniFilter Whole House Filter Replacement Cartridge

    TO1SS OmniFilter Whole House Water Filter Replacement Cartridge

    Designed to fit into any brand of whole house water filtration system that accepts standard 9 3/4 x 2 1/2 inch cartridges Learn More
    (Retail Price: $8.15 ) $6.99
  5. RS7-SS OmniFilter Whole House Filter Replacement Cartridge
  6. RS3-SS OmniFilter Whole House Filter Replacement Cartridge
  7. RS2-SS OmniFilter Whole House Filter Replacement Cartridge
  8. RS14-SS OmniFilter Whole House Filter Replacement Cartridge

    RS14-SS OmniFilter Replacement Whole House Water Filter Cartridge

    Fits any brand of whole house water filter system that uses 9 3/4 x 2 1/2 water filter cartridges Learn More
    (Retail Price: $5.74 ) $2.99
  9. RS14-DS OmniFilter Whole House Filter Replacement Cartridge (2-Pack)

    RS14-DS OmniFilter Whole House Water Filter Cartridges (2-Pack)

    Fits any brand of whole house water filtration system that uses standard 9 3/4 x 2 1/2 filter cartridges Learn More
    (Retail Price: $8.15 ) $6.99
  10. P5-D Culligan Level 4 Whole House Filter Replacement Cartridge (2-Pack)

    P5-D Culligan Level 4 Whole House Filter Replacement Cartridge (2-Pack)

    Fits Culligan HF-150, HF-160, HF-360, HF-365, and any brand of whole house water filter system that uses standard 9 3/4 x 2 1/2 filter cartridges Learn More
    (Retail Price: $12.98 ) $8.99
  11. RS4-DS OmniFilter Whole House Filter Replacement Cartridge (2-Pack)

    RS4-DS OmniFilter Whole House Filter Replacement Cartridge (2-Pack)

    Fits any brand of whole house water filter system that uses standard 9 3/4 x 2 1/2 filter cartridges Learn More
  12. C2 Pentek Undersink Filter Replacement Cartridge
  13. C1 Pentek Undersink Filter Replacement Cartridge
  14. P1-D Culligan Level 4 Whole House Filter Replacement Cartridge (2-Pack)

    P1-D Culligan Whole House Water Filter Replacement Cartridge (2-Pack)

    Fits Culligan HF-150, HF-160, HF-360 HF-365, and any brand of whole house water filtration system that uses standard 9 3/4 x 2 1/2 filter cartridges Learn More
    (Retail Price: $12.98 ) $11.99
  15. AP410 Aqua-Pure Water Filter Cartridge Set (2-Pack)

    AP410 Aqua-Pure Water Filter Cartridge Set (2-Pack)

    Fits the Aqua-Pure AP400 and AP400SS Point of Use water filtration systems Learn More
    (Retail Price: $71.29 ) $57.99
  16. CB6 OmniFilter Whole House Filter Replacement Cartridge

    CB6 OmniFilter Whole House Water Filter Cartridge

    Fits any brand of whole house water filtration system that uses 9 3/4 x 4 1/2 water filter cartridges Learn More
    (Retail Price: $80.49 ) $67.99
  17. PENTEK-SLIM-PR10-JG38 Pentek Undersink Filter 10 inch Housing
  18. 158008 Pentek Slim Line Filter Housing - Clear

    158008 Pentek Slim Line Water Filter Housing - Clear

    Fits standard 3/8-inch water lines Learn More
    (Retail Price: $16.55 ) $12.39
  19. 158117 Pentek Slim Line Filter Housing - Clear
  20. 158642 Pentek Slim Line Filter Housing - Blue

    158642 Pentek Slim Line Filter Housing - Blue

    (Retail Price: $25.29 ) $19.99
  21. 158643 Pentek Slim Line Filter Housing with Pressure Relief Valve - Clear
  22. 3G-SLIM-38-NPT10 Pentek Whole House Slim 10 inch Filter Housing

22 Item(s)

Grid  List 

Set Ascending Direction
Scroll To Top