Spa Frog Blue Fresh Mineral Water Cartridges should be replaced every four months. These will fit either your floating Spa Frog system or if you have a built in Spa Frog system in your hot tub
Pre filled cartidges for no mess, no fuss and no stress watercare. Kills bacteria while using up to 50% less bromine. The mineral cartridge lasts up to 4 months. The bromine cartridge will last 2 to 4 weeks, dependign on hot tub usage. The minerals last up to four full months, while the bromine can be dialed in to meet your precise needs, usually about 2 to 4 per cartridge. Just snap the two cartridges into the floating cap and relax! The SPA FROG Floating System eliminates the hassles of daily feeding with chlorine granules that last less than 24 hours. UV and Ozone systems are incomplete, requiring some chemical back-up with no way to precisely feed it and they can be expensive to maintain. With SPA FROG, your bromine is cut in half and your workload is reduced – changing a cartridge roughly once a month.