Introduction

water coming out of a kitchen faucet »
Millions of households have switched to bottled drinking water because of concerns over the purity or taste of their tap water. Such problems exist across the country, regardless of whether the water comes from municipal pipeline or ground well. However, there’s an easier, less expensive way to obtain clean drinking water: install an under-sink water-filtration system.

The system has two main components: 1) A plastic filter housing that’s screwed inside of the sink cabinet; housing typically contains two replaceable filters, and 2) A compact gooseneck faucet that’s mounted on the sink deck or countertop for dispensing the clean, filtered water.

The filter housing attaches to the gooseneck faucet with flexible plastic tubing, and to the existing cold-water supply line with soldered copper tubing and fittings. If you’re new to plumbing work, don’t worry. This Old House plumbing and heating expert Rich Trethewey shows each step of the process.
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    Tools List

    • drill
      Drill/driver with step-drill bit,
      to drill hole in sink top
    • propane torch
      Propane torch
    • emery cloth
      Emery cloth,
      for cleaning pipe prior to soldering
    • adjustable wrench
      Adjustable wrench
    • tongue-and-groove pliers
      Tongue-and-groove pliers
    • tubing cutter
      Close-quarters tubing cutter
    • basin wrench
      Basin wrench,
      to tighten hex nut that holds filter faucet to sink top
    • copper fitting brush
      Copper fitting brush (for cleaning copper tubing and fittings
    • 16-foot tape measure
      Tape measure
    • eye goggles
      Eye goggles
    • centering punch
      Center punch,
      to strike a starting point on stainless steel sink deck prior to drilling

    Shopping List

    1. WATER FILTER KIT

    2. LEAD-FREE SOLDER AND PIPE FLUX

    3. 1/2-INCH COPPER TEE

    4. SEVERAL FEET OF 1/2-INCH COPPER TUBING

    5. 1/2-INCH FEMALE ADAPTER

    6. 1/2-INCH TO 1/4-INCH REDUCER

    7. 1/2-INCH BALL VALVE

    8. TEFLON TAPE

    applied to reducer before threading onto female adapter



    9. TARP OR BLANKET

    to protect kitchen floor



    10. FIRE-RESISTANT CLOTH AND FIRE EXTINGUISHER