However often you need it. Initially, this could be as frequently as every couple of days if the pond has a lot of algae. We put "if needed" because ponds will vary a lot with stocking levels, partial water changes, debris blowing into them, weather, etc. If the pond isn't getting water changes every 2-4 weeks or is really heavily stocked, then we recommend a partial water change prior to each dose to help balance the water chemistry and remove some of the organic matter causing the issue.
Date published: 2019-07-09