FROG Mineral Cartridge - For @ease Smartchlor and Serene In-Line Systems Caldera cold plunge filter Prodigy 1995-2007

Prodigy 1995-2007

Use weekly to help keep your spa water sparkling clear and incredibly relaxing

If granulated chlorine did not have stabilizer in it

Locking drawstrings on each side of the cap allow you to cinch the cover to the exact spa dimension - and easily allows for curved

Matches interior hot tub colors: Azurite & Sterling

FROG Mineral Cartridge - For @ease Smartchlor and Serene In-Line Systems Caldera cold plunge filter Prodigy 1995-2007The FROG Mineral Cartridge is the blue cartridge that is used in both FROG @Ease SmartChlor (Chlorine) and Serene (Bromine) In Line Systems. The FROG blue Mineral Cartridge is replaced every 4 months. The FROG system will not work correctly if the blue mineral cartridge is more than 4 months old. For use in: FROG @ease SmartChlor in line system FROG Serene (Bromine) in line system Please Note: FROG makes blue mineral cartridges that say @ease and