Under Sink

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  • Under Sink Housing Assemblies

    Under Sink Housing Assemblies

  • Reverse Osmosis Systems

    Reverse Osmosis Systems

    Reverse Osmosis Water Filter

    What is a Reverse Osmosis System?

    Source: WQA

    A water treatment process that removes undesirable materials from water by using pressure to force the water molecules through a semipermeable membrane. This process is called "reverse" osmosis because the pressure forces the water to flow in the reverse direction (from the concentrated solution to the dilute solution) to the flow direction (from the dilute to the concentrated) in the process of natural osmosis. Visit our 'How Does Reverse Osmosis Work' guide to learn more and see the steps in a reverse osmosis system.

    RO systems are also used to purify water before sterilizing it with a Ultraviolet Systems or attached to a Bottleless Water Cooler.

    What does a Reverse Osmosis Water Filter Remove?

    Reverse osmosis water filtration systems can remove 90% of total dissolved solids (TDS) from water and can provide the purest water available for your home. Reverse osmosis water filters remove a wide range of contaminants and minerals from your drinking water, including sand, chlorine, fluoride, cryptosporidium, and hexavalent chromium.

    Reverse Osmosis Guides

    Reverse Osmosis Installation Guide Replacing Cartridges & Sanitizing System Reverse Osmosis System Comparison Pressure / Temperature Chart

  • CA Ware EP-MAF Residential Drinking Water System

    $149.00
    Part#: EP-MAF-System
    • Hollow Fiber Membrane Removes Bacteria
    • Removes Chlorine, Taste & Odor
    • Removes Cryptosporidium, Giardia & Lead
    • Top Quality John Guest Fittings, Valves & Tubing
    • Includes Luxury Faucet & Accessories
    • Low Cost Alternative to Reverse Osmosis
    • Space Saving Under Sink Filter
  • Doulton QT Under Counter System

    $119.00
    Part#: W9330229
    • Removes Chlorine, Taste & Odor
    • Removes Cryptosporidium, Giardia & Lead
    • Under Sink Filter – No Faucet
    • Includes Doulton Ultracarb Candle
    • Removes Bacteria
    • Space Saving Under Sink Filter
  • Doulton QT Under Counter System with Faucet

    $159.00
    Part#: W9330229-System
    • Removes Chlorine, Taste & Odor
    • Removes Cryptosporidium, Giardia & Lead
    • Under Sink Filter with Faucet
    • Includes Doulton Ultracarb Candle
    • Removes Bacteria
    • Space Saving Under Sink Filter
  • H2O International US3-I, 5-Stage Under Sink Water Filter

    $149.00
    Part#: H2O-US3-I
    • Filtered Water From Your Existing Faucet
    • Granular Carbon & KDF 55 Media
    • Inline Under Sink System
    • Maintenance Free for 3 Years
    • Removes Chlorine, Taste, Odor & Lead
    • Includes Pressure Reducing Valve
  • H2O International US3, 5-Stage Under Sink Water Filter

    $179.00
    Part#: H2O-US3
    • Granular Carbon & KDF 55 Media
    • Made in the USA
    • Maintenance Free for 3 Years
    • Removes Chlorine, Taste, Odor & Lead
  • H2O International US4-13 Under Sink Water Filter

    $179.00
    Part#: H2O-US4-13
    • Filtered Water From Your Existing Faucet
    • Granular Carbon & KDF 55 Media
    • Inline Under Sink System
    • Maintenance Free for 3 Years
    • Replacement for NSA 100S & NSA 100SX
    • Includes Pressure Reducing Valve
  • H2O International US4-200, 7-Stage Under Sink Water Filter

    $259.00
    Part#: H2O-US4-200
    • 1 Micron Carbon Block Cartridge
    • Granular Carbon & KDF 55 Media
    • Removes Chlorine, Taste, Odor & Lead
    • Removes Cryptosporidium & Giardia
  • H2O International US4-I, 5-Stage Under Sink Water Filter

    $199.00
    Part#: H2O-US4-I
    • Filtered Water From Your Existing Faucet
    • Granular Carbon & KDF 55 Media
    • Inline Under Sink System
    • Maintenance Free for 3 Years
    • Removes Chlorine, Taste, Odor & Lead
    • Includes Pressure Reducing Valve
  • H2O International US4, 5-Stage Under Sink Water Filter

    $229.00
    Part#: H2O-US4
    • Granular Carbon & KDF 55 Media
    • Made in the USA
    • Maintenance Free for 3 Years
    • Removes Chlorine, Taste, Odor & Lead
  • H2O RUS-100, Single Housing Under Sink Filter

    $69.00
    Part#: H2O-RUS-100
    • Ideal for Applications with Limited Space
    • Removes Chlorine, Taste & Odor
    • Removes Cryptosporidium, Giardia & Lead
    • Under Sink Water Filter
    • Top Quality John Guest Fittings, Valves & Tubing
    • Includes Luxury Faucet & Accessories
  • H2O RUS-200 Twin Housing Under Sink Filter

    $119.00
    Part#: H2O-RUS-200
    • Installs Under the Sink
    • Removes Chlorine, Taste & Odor
    • Removes Cryptosporidium, Giardia & Lead
    • Carbon Block & KDF/GAC Cartridges
    • Top Quality John Guest Fittings, Valves & Tubing
    • Includes Luxury Faucet & Accessories
    Top Seller
  • H2O RUS-200-I, Inline Twin Housing Under Sink Filter

    $99.00
    Part#: H2O-RUS-200-I
    • Easy Installation
    • Filtered Water From Your Existing Faucet
    • High Flow System
    • Inline Under Sink Filter
    • Removes Chlorine, Taste & Odor
    • Removes Cryptosporidium, Giardia & Lead
    • Top Quality John Guest Fittings & Tubing
    Top Seller
  • H2O RUS-300-I Inline Triple Housing Under Sink Filter

    $109.00
    Part#: H2O-RUS-300-I
    • Easy Installation
    • Filtered Water From Your Existing Faucet
    • Inline Under Sink Filter
    • Removes Chlorine, Taste & Odor
    • Removes Cryptosporidium, Giardia & Lead
    • Sediment Pre-Filter Cartridge
    • Top Quality John Guest Fittings & Tubing
  • H2O RUS-300, Triple Housing Under Sink Filter

    $129.00
    Part#: H2O-RUS-300
    • Removes Chlorine, Taste & Odor
    • Removes Cryptosporidium, Giardia & Lead
    • Under Sink Water Filter
    • Carbon Block & KDF/GAC Cartridges
    • Sediment Pre-Filter Cartridge
    • Top Quality John Guest Fittings, Valves & Tubing
    • Includes Luxury Faucet & Accessories
  • H2O UCF-01-14-USA, Single Stage Under Sink System (Cartridge & Faucet Sold Separately)

    $25.00
    Part#: UCF-01-14-JG
    • Accepts Industry Standard 10″ Cartridges
    • Assembled in the USA
    • Cartridges & Faucet Sold Separately
    • Under Sink Housing Assembly
  • H2O UCF-01-JG, Single Stage Under Sink Inline System (Cartridge Sold Separately)

    $30.00
    Part#: UCF-01-38-JG
    • Accepts Industry Standard 10″ Cartridges
    • Assembled in the USA
    • Cartridges Sold Separately
    • Easy Installation
    • Filtered Water From Your Existing Faucet
    • Inline Under Sink Housing Assembly
    • Top Quality John Guest Fittings & Tubing
  • H2O UCF-01-JG, Single Stage Under Sink System with Faucet (Cartridge Sold Separately)

    $40.00
    Part#: UCF-01-JG
    • Accepts Industry Standard 10″ Cartridges
    • Assembled in the USA
    • Cartridge Sold Separately
    • Under Sink Housing Assembly
    • Top Quality John Guest Fittings, Valves & Tubing
  • H2O UCF-02-14-JG, Dual Stage Under Sink System (Cartridges & Faucet Sold Separately)

    $45.00
    Part#: UCF-02-14-JG
    • Accepts Industry Standard 10″ Cartridges
    • Assembled in the USA
    • Cartridge & Faucet Sold Separately
    • Under Sink Housing Assembly
    • Top Quality John Guest Fittings, Valves & Tubing
  • H2O UCF-02-38-JG, Dual Stage Under Sink Inline System (Cartridges Sold Separately)

    $50.00
    Part#: UCF-02-38-JG
    • Accepts Industry Standard 10″ Cartridges
    • Assembled in the USA
    • Cartridges Sold Separately
    • Easy Installation
    • Filtered Water From Your Existing Faucet
    • Inline Under Sink Housing Assembly
    • Top Quality John Guest Fittings & Tubing
  • H2O UCF-02-JG, Dual Stage Under Sink System with Faucet (Cartridges Sold Separately)

    $60.00
    Part#: UCF-02-JG
    • Accepts Industry Standard 10″ Cartridges
    • Assembled in the USA
    • Cartridges Sold Separately
    • Under Sink Housing Assembly
    • Top Quality John Guest Fittings, Valves & Tubing
  • H2O UCF-03-14-JG, Triple Stage Under Sink System (Cartridges & Faucet Sold Separately)

    $65.00
    Part#: UCF-03-14-JG
    • Accepts Industry Standard 10″ Cartridges
    • Assembled in the USA
    • Cartridges & Faucet Sold Separately
    • Under Sink Housing Assembly
    • Top Quality John Guest Fittings, Valves & Tubing
  • H2O UCF-03-38-JG, Triple Stage Under Sink Inline System (Cartridges Sold Separately)

    $70.00
    Part#: UCF-03-38-JG
    • Accepts Industry Standard 10″ Cartridges
    • Assembled in the USA
    • Cartridges Sold Separately
    • Easy Installation
    • Filtered Water From Your Existing Faucet
    • Inline Under Sink Housing Assembly
    • Top Quality John Guest Fittings & Tubing
  • H2O UCF-03-JG, Triple Stage Under Sink System with Faucet (Cartridges Sold Separately)

    $80.00
    Part#: UCF-03-JG
    • Accepts Industry Standard 10″ Cartridges
    • Assembled in the USA
    • Cartridges Sold Separately
    • Under Sink Housing Assembly
    • Top Quality John Guest Fittings, Valves & Tubing
  • Omnipure ELF-1-ML-I System, Inline Under Sink System

    $49.00
    Part#: ELF-1ML-I-System
    • Filtered Water From Your Existing Faucet
    • Inline Under Sink Filter
    • Removes Chlorine, Taste & Odor
    • Removes Cryptosporidium, Giardia & Lead
    • Quick Change Cartridge
  • Omnipure ELF-1-ML-System, Under Sink System with Faucet

    $119.00
    Part#: ELF-1ML-System
    • Removes Chlorine, Taste & Odor
    • Removes Cryptosporidium, Giardia & Lead
    • Includes Luxury Faucet & Accessories
    • Space Saving Under Sink Filter
    • Top Quality John Guest Fittings, Valve & Tubing
  • Pentek 2-Stage, VOC, Lead, Cyst and Parasite Drinking Water System w/ Monitor

    $189.00
    Part#: 158853
    • Quick-Change Cartridges
    • Removes Chlorine, Taste & Odor
    • Removes Cryptosporidium, Giardia & Lead
    • Under Sink Filter with Faucet
    • Monitored System
    Top Seller
  • Pentek LR-1500 Lead Reduction Under Sink Filtration System

    $75.00
    Part#: LR-1500
    • Removes Chlorine, Taste & Odor
    • Removes Cryptosporidium & Giardia
    • Removes Lead
    • Space Saving Under Sink Filter
    • High Flow Inline System
    • John Guest 3/8 Quick-Connect Fittings
  • Watts WQCFU-T-11-KIT, 3-Stage Kwik-Change Ultrafiltration Water Filter System & Faucet

    $149.00
    Part#: WQCFU-T-11-KIT
    • Hollow Fiber Membrane Removes Bacteria
    • Quick-Change Cartridges
    • Removes Chlorine, Taste & Odor
    • Under Sink Filter with Faucet
    • Low Cost Alternative to Reverse Osmosis
    Top Seller
  • Watts WQCFU-T, 11″ 3-Stage Kwik-Change Ultrafiltration Water Filter System

    $109.00
    Part#: WQCFU-T-11
    • Hollow Fiber Membrane Removes Bacteria
    • Quick-Change Cartridges
    • Removes Chlorine, Taste & Odor
    • Under Sink Filter – No Faucet
    • Low Cost Alternative to Reverse Osmosis
  • H2O USRO4-JG, 4 Stage Reverse Osmosis System

    $179.00$209.00
    Part#: USRO4-JG
    • 60 Gallons Per Day Output
    • Assembled in the USA
    • Produces Purified Water Fast
    • Under Sink Reverse Osmosis System
    • Top Quality John Guest Fittings, Valves & Tubing
    • Includes Luxury Faucet, Tank & Accessories
    Top Seller
  • H2O USRO5-JG, 5 Stage Reverse Osmosis System

    $199.00$239.00
    Part#: USRO5-JG
    • 100 Gallons Per Day Output
    • Assembled in the USA
    • Produces Purified Water Fast
    • Under Sink Reverse Osmosis System
    • Top Quality John Guest Fittings, Valves & Tubing
    • Includes Luxury Faucet, Tank & Accessories
    Top Seller
  • Hydrotech QCRO4V-50, Aqua Flo Quick-Change 50 GPD Reverse Osmosis Water Filter System

    $249.00
    Part#: QCRO4V-50
    • 50 Gallons Per Day Output
    • Certified System
    • Produces Purified Water Fast
    • Quick-Change Cartridges
    • Under Sink Reverse Osmosis System
    Top Seller
  • Hydrotech 4 Stage Reverse Osmosis System

    Call for Pricing
    • 25 Gallons Per Day Output
    • Includes Faucet, Tank & Accessories
    • Under Sink Reverse Osmosis System
  • Watts W-525, 5-Stage, 50 GPD Reverse Osmosis System

    $299.00
    Part#: W-525
    • 50 Gallons Per Day Output
    • Certified System
    • Includes Faucet, Tank & Accessories
    • Produces Purified Water Fast
    • Under Sink Reverse Osmosis System
    Top Seller
  • Watts W-525P-110, 5-Stage, 50 GPD Reverse Osmosis System with Aquatec Booster Pump

    $449.00
    Part#: W-525P-110
    • Certified System
    • Great for Low Water Pressure Applications
    • Includes Aquatec Booster
    • Includes Faucet, Tank & Accessories
    • Under Sink Reverse Osmosis System