Pond Boss Forums AQUATIC VEGETATION Controlling unwanted plants Avoiding Algaecides while establishing plants

That depends on water depth and water movement (if any) in the pond. Personal "rule of thumb" here. Water depth 0" to 24" liquid. Over 24" depth granular.

If wind is moving water in shallower water, I might use granules instead. It's a seat of the pants thing tho.....