The Leisure Time Spa Mineral Purifier - 12 Cartridges contains natural
purifying minerals known to help control bacteria and prevent algae.
Designed to simplify water care by reducing sanitizer demand, this
purifier improves filter efficiency and can be used with bromine,
chlorine, ozone and non-chlorine shock. Easy to use. Fits most filters.
Lasts up to four months in spas up to 1000 gallons.