Liming with agricultural limestone won't harm the pond. It is used as a fisheries management tool to raise the total alkalinity of the pond. Ponds actually need to be between 20-300mg/liter total alkalinity for successful production. It increases the availability of phosphorus for plant and algae use. Increasing total alkalinity of the water increases the carbon dioxide available for photosynthesis by the algae thus increasing the production capability of the pond. However, do not use slaked lime as this can raise the pH too high and cause a fish kill. Optimum pH range for fish 6.5-9. Hope this helps.
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