Originally Posted by
Roddy Conrad
I did this process with two ponds loaded with a very high fish density, one full of large golden orfes below all that horrible stringy algae, the other full of lovely large sarassa comet goldfish.
The LC50 (dose at which 50% of the fish die if the dose remains active for two days and has nothing to react it away) of sodium percarbonate is (to my recollection, will check and post on this again) about 0.6 pounds per 1000 gallons. However, with stringy algae present, the hydrogen peroxide component of the sodium percarbonate immediately reacts with stringy algae as it is produced form sodium percarbonate hydrolysis, so there was never much active dissolved hydrogen peroxide during the treatment.
It works to get rid of stringy algae, and certainly should help clear the brown color of the pond water. And can be used to reverse PP treatments, and to be used instead of low level PP treatments to improve water quality.
I have just been playing with it for a week now, thought some of you with the normal spring stringy algae season would find these trials interesting.
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