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Re: [APD] hydrogen peroxide dosage

Stuart Halliday wrote:
> Seems like a lot.
> At 3% solution, surely 0.05ml per litre is enough to oxygenate?
> ie 5ml for 100 litres?
> Mind with this small level you can repeat dosage every 12 hours.

It seems, from all the research I can find, as though anything below 
10ppm is safe for bacteria and fish. Invertebrates might be more 
sensitive, but I've repeatedly dosed up to 15 ppm with no visible 
ill-effects on fish or snails. With 3% peroxide, adding 1 tablespoon per 
8 gallons will yield very close to 15 ppm.
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