Nature 2’s CF Pool Purifier gives pool owners a way to dramatically reduce their chlorine consumption simply by dropping this insert into your cartridge filter. CF Pool Purifier significantly reduces your pools appetite for chlorine, instead using copper and silver to boost sanitation. This insert improves swimmer comfort by lowering the amount of skin and eye burn as well as the typical chlorine odor, and improves water quality by making it seem softer and more natural. Lasting 4 months, this filter insert can be adjusted to fit most common filters, giving you more time to enjoy your pool rather than watch chlorine levels.