Hi 4 season
H2O2 is hydrogen peroxide
In Australia its available in chemists and also some supremarkets in the first aid sort of area. The one for sale is usually 5% here.
There is a lot of write up about it here
http://aquariumlife.com.au/showthrea...highlight=h2o2
http://aquariumlife.com.au/showthrea...highlight=h2o2
http://aquariumlife.com.au/showthrea...highlight=h2o2
Sorry to Aquaquotient if its not ok to post links to another forum
Please delete if it offends
Graeme
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