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Water Filtration

Water Filtration for the whole home and at-the-sink. Shop complete systems, filter housings and cartridges, RO drinking water, and maintenance parts to improve taste, reduce chlorine/chloramine, and protect fixtures and appliances.

Featured brands: 3M, American Granby, Campbell, Elkay, EWS (Environmental Water Systems), The Source (twistIIClean), and Zurn Wilkins. Browse each brand below or filter to the exact type you need.

Shop by need

  • Whole-home systems: carbon filtration for city water; options with salt-free conditioning to help with scale (model dependent)
  • Under-sink drinking water: high-flow faucet filters, compact multi-stage kits, and RO (reverse osmosis) systems
  • Filter housings & cartridges: standard and high-flow sizes, sediment, carbon block/GAC, specialty media
  • Accessories & parts: install kits, valves, gauges, O-rings, wrenches, and replacement cartridges

Quick choosing guide

  1. Start with your source: municipal (chlorine/chloramine) vs well water—match filters or systems accordingly.
  2. Pick the application: whole-home (showers, laundry, appliances) or point-of-use (drinking/cooking at the sink).
  3. Size for flow: select system/house size to maintain pressure; match cartridge size (10", 20", “BB”) and micron rating to your goal.
  4. Taste vs maximum reduction: high-flow carbon for everyday taste/odor vs RO for maximum dissolved-solid reduction at a faucet.
  5. Plan maintenance: note change intervals (typically 6–12 months for cartridges; multi-year media on whole-home units).


  • Water filtration system with various components on a white background
    Water filtration system with three cylindrical filters and a faucet on a white background

    EWS RO4 & RO4-UV – Four-Stage Under Sink Reverse Osmosis Systems with Optional UV Protection

    EWS
    $ 801.75 - $ 1,026.75
    $ 801.75 - $ 1,026.75
    $ 801.75 - $ 1,026.75
    $ 801.75

    EWS RO4 & RO4-UV – Four-Stage Under Sink Reverse Osmosis Drinking Water Systems The EWS RO4 is a high-performance reverse osmosis system that d...

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    $ 801.75 - $ 1,026.75
    $ 801.75 - $ 1,026.75
    $ 801.75 - $ 1,026.75
    $ 801.75
  • Three 'Essential' brand water filters on a white background
    Three 'Essential' brand water filters and UV light on a white background

    EWS - F.SET.RO4 & F.SET.RO4-UV – Replacement Filter Sets for EWS RO4 Under Sink Reverse Osmosis Systems

    EWS
    $ 486.75 - $ 569.25
    $ 486.75 - $ 569.25
    $ 486.75 - $ 569.25
    $ 486.75

    F.SET.RO4 & F.SET.RO4-UV – Replacement Filter Sets for Under Sink EWS RO4 Reverse Osmosis Systems Keep your reverse osmosis system performing l...

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    $ 486.75 - $ 569.25
    $ 486.75 - $ 569.25
    $ 486.75 - $ 569.25
    $ 486.75
  • Water filtration system with three cylindrical filters, UV Light, and a faucet on a white background
    Water filtration system with three cylindrical filters and a faucet on a white background

    EWS RO3 & RO3-UV – Essential Three-Stage Under Sink Reverse Osmosis Systems

    EWS
    $ 726.75 - $ 951.75
    $ 726.75 - $ 951.75
    $ 726.75 - $ 951.75
    $ 726.75

    EWS RO3 & RO3-UV – Essential Three-Stage Under Sink Reverse Osmosis Systems The EWS RO3 is a high-performance, three-stage reverse osmosis (RO)...

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    $ 726.75 - $ 951.75
    $ 726.75 - $ 951.75
    $ 726.75 - $ 951.75
    $ 726.75
  • Three 'Essential' brand water filters and UV Light with labels on a white background
    Three 'Essential' brand water filter cartridges on a white background

    EWS - F.SET.RO3 & F.SET.RO3-UV – Replacement Filters for EWS Under Sink Reverse Osmosis RO3 & RO3-UV Systems

    EWS
    $ 426.75 - $ 509.25
    $ 426.75 - $ 509.25
    $ 426.75 - $ 509.25
    $ 426.75

    F.SET.RO3 & F.SET.RO3-UV – Under Sink Replacement Filters The F.SET.RO3 and F.SET.RO3-UV are the official replacement filter kits for the EWS R...

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    $ 426.75 - $ 509.25
    $ 426.75 - $ 509.25
    $ 426.75 - $ 509.25
    $ 426.75
  • EWS DWS-UV mechanical-under-sink-3-stage-drinking-water-filtration-system-plus-uv-disinfection-
    An under-sink 3-stage drinking water filtration system with UV disinfection made up of three filter units labeled as ESSENTIAL, along with a control panel and tubing.

    EWS DWS-UV – Essential Under Sink Drinking Water System with Ultraviolet Protection

    EWS
    $ 704.25 - $ 704.25
    $ 704.25
    $ 704.25 - $ 704.25
    $ 704.25

    EWS DWS-UV – Essential Under-Sink Drinking Water System with Ultraviolet Protection The EWS DWS-UV is the ultimate under-sink drinking water system...

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    $ 704.25 - $ 704.25
    $ 704.25
    $ 704.25 - $ 704.25
    $ 704.25
  • EWS DWS Under counter Kit Breakdown
    An under-sink 3-stage drinking water filtration system with three cylindrical carbon filters housed in a white cabinet with blue and white labeling.

    EWS DWS– Essential Under Sink Drinking Water System

    EWS
    $ 479.25 - $ 479.25
    $ 479.25
    $ 479.25 - $ 479.25
    $ 479.25

    EWS DWS– Essential Under-Sink Drinking Water System The EWS DWS Essential Drinking Water System is a compact, high-performance under-sink system en...

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    $ 479.25 - $ 479.25
    $ 479.25
    $ 479.25 - $ 479.25
    $ 479.25
  • Three 'Essential' brand water filters on a white background

    EWS - F.SET.DWS Essential Under Sink DWS Filter Set

    EWS
    $ 246.75 - $ 246.75
    $ 246.75
    $ 246.75 - $ 246.75
    $ 246.75

    F.SET.DWS – Replacement Water Filter Set for EWS DWS The F.SET.DWS replacement set keeps your EWS Essential Drinking Water System (DWS) performing ...

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    $ 246.75 - $ 246.75
    $ 246.75
    $ 246.75 - $ 246.75
    $ 246.75
  • EWS SS-2.5 Max Flow Filter setup
    An under-sink single stage drinking water filtration system with white color and labeled 'MAX FLOW'.

    EWS SS-2.5 Max Flow – High-Flow Under Sink Drinking Water Filtration

    EWS
    $ 321.75 - $ 321.75
    $ 321.75
    $ 321.75 - $ 321.75
    $ 321.75

    The EWS SS-2.5 Max Flow (often branded “Max Flow”) is a powerful under-sink drinking water filter engineered to deliver filtered water at the speed...

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    $ 321.75 - $ 321.75
    $ 321.75
    $ 321.75 - $ 321.75
    $ 321.75
  • A white cylindrical water filter replacement unit labeled 'MAX FLOW' with product information and branding on the label.

    EWS - F.SET.SS-2.5 - SS Filter Replacement - Under Sink Max Flow Filtration System

    EWS
    $ 171.75 - $ 171.75
    $ 171.75
    $ 171.75 - $ 171.75
    $ 171.75

    Key Benefits & Features High flow, no compromise — up to 2.5 gallons per minute, matching typical faucet speeds. No tank, no water waste — ...

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    $ 171.75 - $ 171.75
    $ 171.75
    $ 171.75 - $ 171.75
    $ 171.75
  • EWS - Under-Sink Single Stage Drinking Water Filtration System - - Mechanical - Big Frog Supply - 2
    Water filter cartridge with 'Essential' branding on a white background

    EWS - SS-1.0 - Single Stage Under Sink Drinking Water Filtration System

    EWS
    $ 171.75 - $ 171.75
    $ 171.75
    $ 171.75 - $ 171.75
    $ 171.75

    EWS SS-1.0 – Essential Single Stage Filtration System The EWS SS-1.0 is a compact and effective under-sink water filtration system designed to deli...

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    $ 171.75 - $ 171.75
    $ 171.75
    $ 171.75 - $ 171.75
    $ 171.75
  • Water filter cartridge with blue top and white body on a white background

    EWS - F.SET.SS-1.0 – Replacement Filter for Under Sink EWS SS-1.0 Single Stage System

    EWS
    $ 81.75 - $ 81.75
    $ 81.75
    $ 81.75 - $ 81.75
    $ 81.75

    F.SET.SS-1.0 – Replacement Filter for EWS SS-1.0 Single Stage System The F.SET.SS-1.0 is the official replacement cartridge for the EWS SS-1.0 Esse...

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    $ 81.75 - $ 81.75
    $ 81.75
    $ 81.75 - $ 81.75
    $ 81.75
  • Three 'Essential' brand water filters on a white background

    EWS -F.SET.DWS-UV – Replacement Filter Set with UV Lamp for Under Sink EWS DWS-UV

    EWS
    $ 329.25 - $ 329.25
    $ 329.25
    $ 329.25 - $ 329.25
    $ 329.25

    F.SET.DWS-UV – Replacement Filter Set with UV Lamp for EWS DWS-UV The F.SET.DWS-UV is the complete replacement kit for the EWS DWS-UV Essential Dri...

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    $ 329.25 - $ 329.25
    $ 329.25
    $ 329.25 - $ 329.25
    $ 329.25

Pro tips: Install whole-home systems after the meter/PRV and before branches; bypass hose bibbs if you want untreated outdoor taps. Always flush new cartridges, keep spare O-rings on hand, and set a reminder for filter changes. Not sure where to start? Tell us city/well, pipe size, and what you want to improve—taste, odor, chlorine/chloramine, or scale—and we’ll dial it in.

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