Petco Automatic Cat Water Fountain Charcoal Replacement FiltersOur Petco Automatic Cat Water Fountain Charcoal Replacement Filters are for use with the Petco Automatic Cat Water Fountain & Petco Waterfall Cat Fountain, sold separately.Each replacement filter pack includes three replacement filters which will last up to three months. Using a charcoal filter removes impurities and makes your cat's water clean and fresh. In addition, the dual polyester pad technology helps capture excess debris.Filters should be replaced approximately every 2-4 weeks depending on number of cats and your water clarity.

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