Do filters require maintenance?

Yes. If your filter cartridge is not replaced according to the manufacturer's guidelines, you run the risk of it no longer performing as designed. For example, a filter designed to remove 99% of lead can only do so for a specific volume of water. Filters that are not maintained or replaced according to the manufacturer's schedule can also harbor bacteria. Many filters have a device that indicates when to change the filter.

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1. Do filters require maintenance?
2. How much do filters generally cost?