THIS IS NORMAL ! Remember, you cannot over-backwash a pool filter. Green or cloudy water will quickly clog a filter, therefore you may have to backwash your filter many times a day until the pool clears. Run your filter 24 hours a day and backwash 3 or 4 times a day for quickest results.Our standard pitcher filters use coconut-based activated carbon with ion exchange resin in a BPA-free housing to reduce chlorine taste and odor, zinc, and the health contaminants copper, cadmium and mercury*.