ZODIAC NATURE 2 SPA MINERAL CARTRIDGE - W20750 Nature2 Spa uses a patented mineral-bed technology to destroy bacteria. Its revolutionary process significantly improves the look, feel and smell of your spa water by dramatically reducing chlorine and bromine requirements. If used with Potassium Monopersulfate (MPS), the most recommended spa oxidant, Nature2 Spa becomes a complete spa sanitizing system - the only non-chlorine spa sanitizing option available. The best part? Nature 2 makes managing your spa easy! Simply drop the Nature2 cartridge into your filter and notice the difference. Your spa water will take on new sparkle and clarity while using 50 percent less chlorine or bromine. No more red stinging eyes or faded bathing suits! Features: - Simply drops right into your filter - Works with your existing filtration system - Hassle-free maintenanc