The Lo-Chlor Ultra Zyme Pro product uses a special commercial strength liquid formula that is intended to make hard water easier to treat in larger pools. It is designed for professional pools that have a hard time balancing chemicals often caused by high bather loads that create persistent hazy water, high chlorine demand, and waterline scum buildups. Ultra Zyme is made to combat these issues in pools that have more frequent swimmers using the pool, in a safe and easy application.