Jack's Magic Natural Multi-Enzyme SUPER PACS is a unique blend of natural enzymes developed specifically for swimming pools and spas. SUPER PACS combine the high performance of a powerful multi-enzyme action with the biodegradable characteristics of a truly “green” product. SUPER PACS break down oils, lotions, makeup and other organic contaminants common to swimming pools and spas, preventing scum build-up and cloudy, dull water. SUPER PACS are highly concentrated - a single SUPER PAC treats up to 20,000 gallons of pool (or spa) water for 2 weeks. This product is easy to use - just drop it in the skimmer basket and enjoy beautiful water!