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Concentrated Filter Cleaner is excellent for both pool and spa cartridge filters.

Concentrated Filter Cleaner is excellent for both pool and spa cartridge filters.  This unique cleaner will greatly improve your filter's life and efficiency.  Cleans grease, body oils, dirt, and mineral deposits.  Scale and suntan lotion disappear and your cartridge filters will last longer and operate more efficiently.  Also works on sand and diatomaceous earth filters.  Remove cartridge and place in an appropriate-sized container, pre-mix cleaner with water, soak for 16 hours, rinse with hose and allow to dry.  Recommended Usage: 8 oz. per 1.25 gallons of water.