Highly concentrated flocking agent takes cloud causing particles that are lingering in swimming pool water and forces them to collect on the pool bottom. Once on the bottom, they can be easily removed with your vacuum. Compatible with all sanitizers, works faster the cloudier the water is, can help to reduce Total Dissolved Solids (TDS) in pool water. Do not use unless you can vacuum to waste. Adjust pool pH to 7.5 or higher, with filter running in the recirculate position, use 8 oz. per 10,000 gallons of pool water over the entire pool surface. Add 16 oz. per 10,000 gallons for severely cloudy pools.