Jack's Magic Natural Multi-Enzyme Super Pacs break down oils, lotions, make up and other common organic pool and spa contaminants, preventing scum line build up and dull cloudy water. Super Pacs are highly concentrated - just one super Pacs treats up to 20,000 gallons of pool (or spa) water for two weeks. This product is easy to use - simply drop in the skimmer basket and enjoy beautiful water!