How to Change Kitchen Filter Cartridges

To change cartridges for kitchen canister filters:

With Undercounter Filters, turn off the water flowing to your kitchen sink and turn on the faucet before opening the canisters to drain a little more water.   Get a bucket under the filter to catch the water inside when you open the canister.  After opening, pour the water from the canister into your bucket.

With Countertop Filters, you can just set your filter in your sink to drain the water when you open the canisters.

Open the canisters by unscrewing them counterclockwise (no screws, use the free wrench we sent you.) Observe which filter is in which canister, and which side is up – take out the old and put in the new ones.

Clean the canisters as needed.

Occasionally, especially if you went too long before changing filter cartridges, they can stick and be hard to open. We send a free plastic wrench with every white finish kitchen canister filter, but you can’t use them on the chrome finish.  It’s just like a pickle jar that doesn’t want to open. Once you get it started it will go easily. If you have trouble, you might try a jar gripper, get an extra pair of hands to help you, or if you must – tap on the base of the canister while you try to turn the other way so as to break the seal.

With standard kitchen canister filter configurations, the Wide-Spectrum filter cartridge, with KDF and Carbon, goes last in line. Therefore if you have a 2-canister, the other cartridge, whatever it is, goes first in line.

With all kitchen canister filters that work on Fluoride, the Fluoride Cartridge (either FR-1 Activated Alumina or BC-1 Calcium-Based Carbon) goes just before the last filter.  Therefore, in a 3-canister filter, that puts the Fluoride Cartridge in the middle canister.

Other specialty filter cartridges including for Chloramines, Sediment, Hardness, Arsenic, Nitrates or an extra KR101N go in the first canister as the water flows.



Friends of Water is a family-owned and family-run business founded in January 2006. We work to save water, filter water and celebrate water.

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