Why is an Aqua Touch pool cleaner than a typical pool?
Chlorine is a useful sanitizer, and in high concentrations can also be used to kill algae. But it was never intended to eliminate dirt. That is why chlorine does nothing to eliminate stains in your pool plaster.
The Aqua Touch enzyme mix contains anti-dirt enzymes, as well as enzymes which remove dead organic matter. The anti-dirt enzymes attack and eliminate dirt, regardless of whether the dirt is in your pool water or embedded in your pool plaster. The enzymes which remove dead organic matter not only clean the pool water and pool plaster, they also exfoliate you as you swim.