Spa FROG knows your number one priority is relaxation. Its unique blend of minerals works together to make your water softer and sparkling clear. To keep you relaxing, Spa FROG minerals destroy bacteria while neutralizing pH. Simply drop Filter FROG into your Hot Tub filter cartridge, filter well or skimmer and no hassles for four full months. Spa FROG is about a new way to care for water that reduces chlorine or bromine use up to 50%.