The Frog Pool Tender Cycler system delivers a unique bacteria-killing combination: sanitizing minerals plus a very low level of chlorine. The result is Fresh Mineral Water that gives you Cleaner, Clearer, Softer and Easier water to maintain. Using fresh minerals means you use way less chlorine. Chambers are prefilled so theres no mess, no guess, no stress. It kills bacteria 2 ways and uses up to 50%* less chlorine. The exclusive delivery system for worry-free Fresh Mineral Water for pools up to 25K gallons. No daily dosing required, and installation is easy. All FROG Pool Tender Chambers fit inside the Cycler with a precise control dial that meters out the right amount for every pool type and use. Comes with a Lifetime Warranty+ excluding O-rings!