Pure-Zyme Pool & Spa Enzyme from Nature’s Care by Haviland

Pure-Zyme Pool & Spa Enzyme from Nature's Care by Haviland.  Broad-spectrum enzyme. Helps reduce waterline build-up. Helps maintain a clean filter and reduce pool & spa maintenance. Does not affect pH, made from all natural ingredients. Continued use creates a pool environment in which algae will struggle to thrive.  In spas, it helps prevent "ring around the spa" by digesting oils and organics.

Add directly to the water 4 ounces per 10,000 gallons of water.  Just add one capful for spas.