What is Free Available Chlorine?
This is the active chlorine in the water that has not combined with organic matter and is therefore available for killing bacteria and algae. The proper range for free chlorine residual is 1-3 ppm. Below 1 ppm can cause swimmer irritation, cloudy water and even allow algae to grow. You should test often throughout the summer when the pool is used most.
Submitted by:
California Pools
Dallas, TX
www.aquavalue.com/californiapools
