Features we love Bromine sanitiser for clean spa water Softer on skins than chlorine No strong odour or bleached swimwear! Conditions the water for a softer feel Helps maintain a neutral pH Polishes the water for clarity Pre-filled for no mess, no guess, no stress All about me SPA FROG Floating System uses pre-filled conditioning and bromine cartridges that snap into a reusable floating holder and works in any hot tub. The SPA FROG® Floating System transforms your spa into the perfect environment for soothing relaxation with up to 50% - 80% less bromine than standard bromine spas. Cartridges are easily adjusted to meet the sanitising needs of virtually any size spa. Need to know Replace the conditioning cartridge every 4 months when you drain and refill your spa. The bromine cartridge will last 2-4 weeks depending on use. The changes in the laws and regulations in Europe with regard to the use of silver are defined by many nations. Therefore, we Spa Frog have replaced the mineral cartridge with the NEW conditioning cartridge. How to use Getting your hot tub ready for Spa Frog Drain and refill your hot tub at least every 4 months Clean and replace filter cartridges when dirty Balance water as follows: PH: 7.2-7.8 Total Alkalinity: 80-120ppm Calcium Hardness: 150-250 Total Dissolved Solids: