I use 3-4 tablespoons in my koi pond to kill parasites and to help clear the water from organics, followed by a flush of 1 quart of hydrogen peroxide to fully neutralize it and take away the brown color it leaves behind. I buy PP by the pound at a local fish supply house. You used to be able to buy it at Home Depot in the plumbing section, nothing cleans organic waste in pipes better.
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