Hassle-free: silver spa mineral stick significantly improves look & feel of water,assures an odor-free spa,improves performance of ozone-equipped spas,bring you crystal clear water. High efficiency: Alternative to heavy chemicals,spa silver mineral sticks reduces bromine and chlorine usage by up to 50% in most spas, without high levels of chlorine or bromine-low maintenance,You can now enjoy a safe Spa and hot tub experience with healthier pH levels. Nature-friendly: For Spas up to 500 Gallons/2000L,Spa mineral sticks serve your hot tub with low maintenance and in an nature eco friendly mineral way, No more skin irritations. Easy To Use: Low maintenance and low cost with a duration up to 4 months,easy to install and simplifies water balance,spa mineral stick unaffected by heat,works with your existing flow rates Installation,Just Simply drop the stick into your existing filter and let the silver mineral sticks do their work. Compatibility: Compatible with most spa maintenance products & designed to fit most spas and hot tubs;compatible with ozonators & most suction-side and pressure-see filters.