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Hydrogen Peroxide - by Doc Johnson
After a potassium permanganate treatment, you can turn the water back to crystal clear. Be careful though, treating with peroxide prevents the successful deployment of Potassium permanganate the following day! 

Keywords: Koi, Goldfish & Pond Health Hydrogen Peroxide H2O2 Peroxide Reversal of Potassium Permanganate and Peroxide For Oxygenation

Hydrogen Peroxide is applied the the complete CONCLUSION of a potassium permanganate treatment. The reason is: that you do not want interference with potency of potassium treatment on subsequent days, so, if possible; wait until you are finally DONE with potassium before treating... However, if the water is OPAQUE brown - and you cannot see the fish, you need to decolorize at once and sacrifice the next few days' treatments.

Regular hydrogen peroxide from the grocery store is used. DOSE: One quart of HYDROGEN PEROXIDE 3% per five THOUSAND gallons of water.

Just so you know, our initial dosing was done at a mammoth level: one CUP per one hundred gallons, and we used like six gallons in a five thousand gallon pond with safe results, BUT, and this is a big but; testing to determine the MINIMUM dose needed brought the effective successful dose down to the 1quart/5000G level.

Decolorization requires up to an hour depending upon how your pond circulates, how much KMnO4 is in there, and how much peroxide you used.. Remember that your potassium will fail the next day or two. If you attempt to overdose and "beat" the previous day's peroxide, you could kill your fish. So, don't decolorize with peroxide until you're REALLY done with the KMnO4

Hydrogen peroxide can be used to increase the dissolved oxygen in the system.

H202 + H20 ----------> H20 + 02

Simply use 1/2 cup per hundred gallons. I prefer, however, to apply peroxide in a typical spray bottle, squirting it forcefully under the surface of the water into tanks and vats in trouble, I use 60 squirts per 100 gallons. What you will see is the fish will leave the surface, and swim about as if there was no dissolved oxygen deficit. The time for this to occur is approximately one hour. The benefits are seen for a full 4 hours.

The hydrogen peroxide to use is drugstore 3% peroxide.

It's great in emergencies.

If applied directly to the fish, or applied directly to their water in an undiluted form, gill damage could result, so apply it away from the fish.

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