Mineral ion filter cartridges for Whirlpool HOTSPRING HOT TUB 3 spas (3, grey)

Mineral Ion Filter Cartridges for Whirlpool HOTSPRING HOT TUB 3 Spas The mineral ion cartridge provides clean, crystal-clear spa water without large amounts of heavy chemicals. The active ingredient is zinc. (Inert ingredients include vitamin C, calcium sulfate, zeolite and attapulgite clay, zinc oxide, and magnesium oxide.) A difference you can see, feel, and smell: the spa mineral cartridge improves water quality. Easy to install and low-maintenance, compatible with most spa care products. The mineral filter pen is an easy option for you. Enjoy your relaxing spa experience in complete tranquility. Controlled mineral ion release technology automatically dissolves trace elements in the water.