What can I do about cloudy water?

Cloudy water most often is caused by microbial contamination. Organic contamination comes from bathers (sweat, body oils, loose skin, cosmetic oils, etc). A sanitizer such as chlorine or bromine should be kept at 3 and 5 ppm. Four bathers using your hot tub for 20 minutes can reduce 5 ppm chlorine to zero. The chlorine must be replaced to keep the water clean and clear.