I purchased zeobest ultra because they claim it has anti microbial properties and no negative side effects. I figured if works in ponds it’s not leaching any snake oil so I gave it a try. I'm usually very good at keeping chlorine levels up I've been at zero for the last five day's (nobody has been swimming) still clear. Also the filtering quality of zeobest is in my opinion better than sand but if charge with a little DE it sparkles. The last time I turned my pump off for several days to look for a leak I had a bloom in three days and the water temp was 8 deg colder and chlorine stayed at 1 to 2ppm cya 30. Please no slams I'm just posting my experience. This has not been an intentional experiment but back problems and two small children have made it difficult to get to the store and lug the jugs.

jennifer