Nature2 Express for Pools - Refill Cartridge

This is the replacement cartridge cell for Nature2 Express for above-ground and in-ground pools. Suitable for pools up to 25,000 gallons. A cartridge lasts for six months of continuous use or one swimming season, whichever is less.

Simply remove the old cell, and screw in the refill. Lasts 6 months   Nature2 Express Manual