Discount Water Filters and Air Filters at Discount Filter Store.com

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Reverse Osmosis Water Filter Replacement Cartridges

Keep your reverse osmosis system up and running smooth with a new reverse osmosis water filter.

Your reverse osmosis water filter plays a crucial role in your reverse osmosis filtration system, so it’s important to change it out periodically (ideally once every 6-12 months). By doing so, you’ll extend the life of not only your entire reverse osmosis system but also the life of your RO membrane.

Below you’ll find over 40+ reverse osmosis water filter brands and sets, at a price guaranteed to beat the big box store prices. All of our reverse osmosis water filters are included in our 100% Price Match Guarantee. Meaning if you find a RO water filter priced somewhere else for less than our price, we’ll match the lower price. Shopping for a new RO water filter doesn’t get much better than that.

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WPD-110 American Plumber Whole House Sediment Filter Cartridge (2-Pack)
42632 Brita Chrome SMART OB39 64-Ounce Water Pitcher
WPRF-100 Brita Refrigerator Water Filter
CQE-WC-00909 Crystal Quest Water Cooler
CQP-WC-05900 Crystal Quest Water Cooler
IC-100A Culligan Level 1 Disposable Inline Filter
3WH-STD-S01 3M Filtrete Whole House Sump Filter System
218736300 Frigidaire Refrigerator Icemaker Kit
FXWTC GE SmartWater Whole House Filter Replacement Cartridge
HB-20-20W Harmsco Calypso Blue Replacement Filter Cartridge
GAC-BB Pentek Replacement Filter Cartridge
HFPP-34-PR-10 Pentek Big Blue Whole House 10 inch Filter Housing
KO25G2S Pentek Polypropylene Bag Filters
PD-50-20 Pentek Whole House Replacement Sediment Filter Cartridge
ROM-230TN Pentek Reverse Osmosis Membrane
SLIM-14-WPR5 Pentek Whole House Slim 5 inch Filter Housing
ST-BC-8 Pentek Filter Housing - Stainless Steel
UVS-110-1 Pentek UV System
RF-3375-2-PACK PUR 2-Stage Vertical Faucet Filter Replacement Cartridge - White (2-Pack)
RS-502-DS Rainshowr Shower Filter System with Whedon Designer Shower Head - Chrome
EM-MM SteriPEN Portable UV System
650653 Trojan UV Max UV System
MATRIKX-1-10 KX Technologies MatrikX Undersink Filter Replacement Cartridge
K5633BB Omnipure Inline GAC Filter Cartridge
166227 Pentek Big White Water Filter Housing Assembly (3/4-inch, #20)
EP-5 Pentek Replacement Filter Cartridge
W9223022 Doulton Ultracarb Replacement Ceramic Filter
14x30x1 Merv 6 Universal Air Filter By Tier1 (6-Pack)
20x20x1 Merv 11 Universal Air Filter By Tier1 (6-Pack)
Tier1 500 Carbon Air Filter - 12x12x4 (6-Pack)
BBS Sprite Hand-Held Baby Shower Filter
WFDW120009W DuPont Universal Drinking Water Filter System
660039-R D4-V Viqua UltraViolet Disinfection System

32 Item(s)

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  • WROR American Plumber Reverse Osmosis Replacement Filter Kit
  • WQCSC11 Watts Kwik-Change Sediment Filter Cartridge

    WQCSC11 Watts Kwik-Change Sediment Filter Cartridge

    $11.99
    MSRP: $16.09
    Save 25%
  • 22043 KDF Hydrologic Carbon Pre-Filter For Evolution-RO1000

    22043 KDF Hydrologic Carbon Pre-Filter For Evolution-RO1000

    $45.99
    MSRP: $55.19
    Save 17%
  • WSK-1 Water Sentinel Replacement Water Filters (2-Pack)
  • 41400076 Hydrotech Dual Purpose Water Filter41400076 Hydrotech Dual Purpose Water Filter

    41400076 Hydrotech Dual Purpose Water Filter

    $17.99
    MSRP: $19.54
    Save 8%
  • 20035 Hydrologic 4-Stage Reverse Osmosis Cartridge

    22035 Hydrologic 4-Stage Reverse Osmosis Cartridge

    $136.19
    MSRP: $178.99
    Save 24%
  • 22080 Hydrologic Reverse Osmosis Carbon Pre-Filter
  • Q5328 Omnipure Water Filter

    Q5328 Omnipure Water Filter

    $10.99
    MSRP: $14.94
    Save 26%
  • WHERF Whirlpool Reverse Osmosis System Pre and Post Filter Set
  • 22160 Triton Replacement Sediment Filter Cartridge by Hydrologic
  • Triton Water Filters Replacement Color Changing Di Cartridge Hydrologic 22016
  • 22155 Triton Water Replacement Membrane by Hydrologic

    22155 Triton Water Replacement Membrane by Hydrologic

    $64.39
    MSRP: $87.99
    Save 27%
  • 1236268 Merlin Reverse Osmosis Pre Filter

    1236268 GE Merlin Reverse Osmosis Pre Filter

    $29.99
    MSRP: $32.34
    Save 7%
  • ROR2000-S-05 OmniFilter Reverse Osmosis Pre Filter Replacement
  • WSQC-2 WaterSentinel Reverse Osmosis Carbon GAC Filter Cartridge
  • WQCHFC11 Watts Kwik-Change Hollow Fiber (UF) Water Filter Cartridge
  • S7028 Microline Replacement Filter Cartridge

    S7028 Microline Replacement Filter Cartridge

    $17.99
    MSRP: $20.69
    Save 13%
  • 3M Aqua-Pure AP124 Whole House Water Filter Cartridge

    AP124 3M Aqua-Pure Whole House Filter Replacement Cartridge

    $12.99
    MSRP: $17.24
    Save 25%
  • 3M Aqua-Pure RO3RC Reverse Osmosis Pre and Post Filter Set
  • 22125 Hydrologic Stealth-RO Replacement Sediment Filter

    22125 Hydrologic Stealth-RO Sediment Filter

    $13.99
    MSRP: $15.51
    Save 10%
  • FPMB20-978 Watts Flo-Pro Replacement Filter Cartridge

    FPMB20-978 Watts Flo-Pro Replacement Water Filter

    $3.99
    MSRP: $5.16
    Save 23%
  • FPMB5-20 Watts Flo-Pro Replacement Filter Cartridge

    FPMB5-20 Watts Flo-Pro Water Filter Cartridge

    $5.99
    MSRP: $6.89
    Save 13%
  • FPMB5-978 Watts Flo-Pro Replacement Filter Cartridge

    FPMB5-978 Watts Flo-Pro Water Filter Cartridge

    $4.99
    MSRP: $5.16
    Save 3%
  • MAXETW-975 Watts C-MAX Replacement Filter Cartridge

    MAXETW-975 Watts C-MAX Replacement Water Filter Cartridge

    $12.59
    MSRP: $18.99
    Save 34%
  • MAXPB-975 Watts C-MAX Replacement Filter Cartridge

    MAXPB-975 Watts C-MAX Water Filter Cartridge

    $18.99
    MSRP: $27.99
    Save 32%
  • MAXVOC-975 Watts C-MAX Replacement Filter Cartridge

    MAXVOC-975 Watts C-MAX Water Filter Cartridge

    $18.99
    MSRP: $22.99
    Save 17%
  • 41400008 Hydrotech Reverse Osmosis Filter

    41400008 Hydrotech Reverse Osmosis Filter

    $7.49
    MSRP: $10.99
    Save 32%
  • 41400009 Hydrotech Reverse Osmosis Filter

    41400009 Hydrotech Reverse Osmosis Filter

    $15.69
    MSRP: $23.99
    Save 35%
  • 1266690 Merlin Merlin Reverse Osmosis Sediment Filter

    1266690 Merlin Merlin Reverse Osmosis Sediment Filter

    $17.89
    MSRP: $27.99
    Save 36%
  • 3038333 Merlin Reverse Osmosis Carbon Pre Filter

    3038333 Merlin Reverse Osmosis Carbon Pre Filter

    $28.49
    MSRP: $35.99
    Save 21%
  • S7025 Microline Replacement Filter Cartridge

    S7025 Microline Replacement Filter Cartridge

    $13.89
    MSRP: $14.94
    Save 7%
  • FQROPF GE Profile SmartWater Ultra Plus Reverse Osmosis Replacement Filter Set By Tier1

32 Item(s)

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