The Frog Pool Tender 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 there’s 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!