Hydrogen peroxide

Mostly used by fish keepers to clear the brown precipitate after a potassium permanganate treatment, but we tend forget the general use of this product when it comes to treating our fish.

Hydrogen peroxide (H2O2) is normally sold for general use as Peroxide in 3-15% solutions. The weaker concentration used for health matters and the stronger as a bleach or disinfection. Stronger solutions are highly reactive and can be used for rocket fuel and should best be left alone because of potential health hazards .

It is a stronger oxidiser than potassium permanganate and use will result in much the same action. It decomposes into harmless water and oxygen.


As a dip for protozoa, flukes and bacteria:
15 ml per litre of a 3% solution for 10-15 minutes
25 ml per liter of a 10% solution for 5 minutes

To clear a pond after permanganate treatment use
250 ml per 1000 litre of a 3% solution or
60 ml per 1000 litre of a 10% solution

To instantly neutralize a permanganate treatment. use
30 ml of a 10% solution per 2 g/1000 liter treatment
If you treated 4 g/1000 just double the dose to 60ml of a 10% solution.

Note: if you are ever stuck with a 3% or 15% solution just proportionate to arrive to the correct dosage.

Hydrogen peroxide is often sold Volume strength (vol.) commercially
This tells you how much oxygen is released from 1 ml of hydrogen peroxide solution.

1ml of 10 vol. Hydrogen Peroxide releases 10 ml oxygen and should be a 3% mixture. etc

SO the following applies:
3% is 10 vol
6% is 20 vol
9% is 30 vol
12% is 40 vol

Reference: Dempster and Shipman (1970) and others

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