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Message: [QUOTE="WaterGardener, post: 535736, member: 11923"] Potassium permanganate can be used to clear up pond water. We sometimes use it in the spring and it clears out the slight tan color that my pond can get. It first turns the water purple, then creates a brownish foam as it works on the brown color of the water. I keep the filters going, since at the right dosage it doesn't harm the beneficial bacteria, or the fish, of course, and the filters clear the foam. The water looks amazing afterward. The process is finished when the water clears. Usually takes a few hours. You do need to be careful with it, wearing gloves and eye protection. And it needs to be very accurately measured. We use a balance scale to be sure we get the right amount. It works very well, but it takes some precautions. It's not to be used nonchalantly. . [/QUOTE]