Introducing nature's care open-close, the all natural and broad spectrum formula that is perfect for your pool opening needs. This incredible formula is specially designed to digest oils, lotions, and non-living organics. It safely removes materials that cause water clarity issues and waterline build-up. With nature's care open close, you can say goodbye to cloudy, murky water and enjoy crystal-clear pool water all season long. product features: open-close advanced formula is designed to improve pool water clarity removes oil, lotions and non-living organics that cause waterline build-up for best results, use nature's care open close with a sanitizer during pool openings all-natural and broad-spectrum formula is safe, non-toxic and bio-degradable compatible with sanitizers during pool openings pool can be used immediately after application concentrated liquid formula easy to use net weight: 1 quart