Red Pool FROG 5400 Inline Pool Chemical Cycler 40K gals delivers sparkling, crystal-clear water in a bigger way. Even better, Pool FROG creates Fresh Mineral Water®∞ with FROG minerals and a very low level of chlorine – up to 50%* less! That means it kills bacteria 2 ways, while it keeps water clear and silky soft. The best part – it’s easy to take care of. Prefilled cartridges make it no guess, no mess and no stress.