yupp, thanks for the advice but in this case i know what iam doing. its not that harmfull as people think. but its a great, when not one of the kind, to bleach old plastic. its so hard to get ur hands on it in germany as no pharmacy wanna really sell it (even they are allowed), because u can build a bomb!
it still takes a long time to work.. thinking about to heat the pot up to 50degree all the time .. hehehhe