How to Choose a Water Filter

- October 3, 2018



Watch the full episode:

Ask This Old House plumbing and heating expert Richard Trethewey explains the many options available for filtering drinking water. (See below for a shopping list and steps.)

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Shopping List for How to Choose a Water Filter:
– Pitcher-style water filter
– Faucet-mounted water filter
– Under-sink water filter
– Under-sink reverse-osmosis water filter
– Whole-house water filter
– Sediment filter

Steps for How to Choose a Water Filter:
1. The simplest way to filter tap water is with a pitcher-style water filter, which has a granulated carbon filter that improves taste and odor, and removes some chlorine and sediment.
2. Faucet-mounted filters have a switch that diverts tap water through a granulated carbon filter. Turn on the switch for filtered drinking water; flip it off when washing dishes.
3. For greater water filtration convenience and capacity, install an under-sink, dual-filter system that has its own gooseneck faucet.
4. For optimum point-of-use filtration, consider a reverse-osmosis system. Water passes through a series of three filters, resulting in extremely clean, pure drinking water.
5. Whole-house water filters are installed near the water main and are ideal for delivering clean, filtered water to every faucet throughout the entire house.
6. There are a variety of filters available to remove a wide range of impurities.
7. Sediment filters contain a stainless-steel pre-screen filter and back-flush system that automatically cleans the filter.
8. For the highest level of water filtration, first have your tap water tested, then call in a water-treatment specialist to install a whole-house filtration system designed specifically to treat your water.

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Comments (185)

  • Helpful, thank you for the product information:

    Jack willian - 5 months ago

  • Or buy a whole house filter with a bypass... $40 at Lowe's.

    kopfgeldjagar - 5 months ago

  • In our kitchen we have 2 filters like these ones:
    Do you think it's effective? Oh, we also have UV filter.

    Constanza Kostyushko - 6 months ago

  • The FIRST thing all shale gas workers learn is DON'T DRINK THE TAP WATER in ANY area where they are fracking.
    They pump billions of gallons of toxic chemicals into the ground
    in order to extract the oil and natural gas and the pump billions more into the ground as highly concentrated toxins into waste water injection wells.
    The EPA and local officials are bribed by the industry to tell the public their tap water is "safe" when in FACT it is a cancer causing toxic soup of fracking chemicals.

    Google User - 6 months ago

  • Operating an RO system might give purified water on demand but over all it is more expensive than just purchasing bottle water. Water bill is increased two to three times, the sewer is loaded with excess water and filter must be frequently replaced otherwise it defeats the purpose. Over all RO gives an additional monthly maintenance bill you didn’t have before. JUST BY THE WATER IN A BOTTLE.

    Ted Forbes - 6 months ago

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