The new EcoPur® Charge is made from Master Spas’ filtration fabric. With this design, the fabric is wound tightly into a nautilus master core, creating a catalytic cell. The nautilus fabric cell is encased by a unique “spring core” that allows for maximum water flow and water “charging”. As the hot tub water comes in contact with the EcoPur® Charge master core, a chemical reaction causes zinc and copper hydroxides to form in controlled amounts. Like Mother Nature, when controlled releases of copper and zinc oxides are carried into the filtered spa water, they kill bacteria and create a hostile environment for algae and fungal growth.