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The calculations are made from testing the filters and figuring out how many times the container can be filled before the filter is clogged. It is different with different water types and the minerals contained in the water.

2007-06-19 02:34:00 · answer #1 · answered by sensible_man 7 · 0 0

THEY don't. You have to check it to make sure when it should be changed. If it looks bad or after maybe 3 months then it should be changed.

2007-06-19 00:20:08 · answer #2 · answered by Amber the Tattoo Girl 2 · 0 0

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