Nature2 Spa Mineral StickNature2 Spa Mineral Stick The Nature2 Mineral Stick uses patented mineral bed technology to destroy bacteria and improve the look, feel and smell of your hot tub water by reducing chlorine and bromine requirements. If used with MPS (Potassium Monopersulfate), Nature2 Spa becomes a complete spa sanitizing system. Nature 2 Spa slips into your spa filter and lasts up to four months. Nature2 Spa Features: Simply drops right into your filter. Works with