When to Change a Home Water Filter

Man in kitchen pouring glass of filtered water

 Michael Blann / Getty Images

A water filter takes away tap water impurities like chlorine taste, odor, zinc, copper, cadmium, and mercury. There are several water filters for soft water filtration like activated carbon filters, reverse osmosis, alkaline water ionizers, UV filters, and infrared filters. Pitcher water filters are common and use granulated activated charcoal to remove contaminants. Although they are inexpensive, they require frequent replacements for the filter and cartridge.

When to Change It

Replacing your water filter depends on several factors. Water filters typically have an estimated life cycle that's measured in gallons of water. However, this is only a guideline based on average water use. This isn't always a good indicator since water use varies per household. There are several things that can affect the life of your filter. Consider the following:​

  • The overall condition of your water in terms of contaminants and how much must be filtered.
  • If you have hard water (heavy with minerals), which causes the scale to build up and clog the filter.
  • If you use more water than the average family household.
  • How well your water was previously treated or filtered.

Ultimately, when an active carbon filter becomes clogged (or for some reason can no longer attract particles and contaminants), it becomes ineffective and useless. That's when it's time to replace it.

Signs That It Needs Replacement

If you detect an odor in the water, or it takes on an unpleasant taste, it's most likely time to replace your water filter. There could also be a gradual decrease in water pressure, which signals the need for a new one. You could always use the visual indication (located on filters with clear containers) that let you know when the filter is dirty and in need of a change. Always check the manufacturer's water usage guidelines to make sure you haven't exceeded them.

Why Filter Changes Are Important

Replacing your water filter, as needed, ensures that your water filtration system is working effectively. You should always keep a backup filter on hand, for convenient change-outs. Water filters are sold by brand and the part or model number can be easily found through the system's manual or manufacturer's website.

If you want your water filter to continue to remove potential contaminants, you'll need to replace it frequently. Otherwise, the flow rate of the water being produced from the water filter system will slow down, resulting in a poorly working system (or one that's not working at all).

Buying Guides

Making sure your drinking water is clean and tastes great will go a long way. There are models for carafes, faucets, sinks, and countertops. Water filter costs vary dramatically and can jump at affordable prices like $20 to an overwhelming $2,000. Popular brands like Amway, Aquasana, Brita, GE, and Whirlpool offer an array of filter options that treat water with different methods.

Consider installation, convenience, and water filter tests before purchasing a water filter to invest in for the long-term. Your local or state health department may also be able to provide free test kits for you to better understand the water in your community.

Article Sources
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  1. Choosing Home Water Filters & Other Water Treatment Systems. Centers for Disease Control and Prevention