Hi Marie,
I get mine through amazon.de. I buy the 3% concentration and pay 3,95 euros for a litre of best grade.
There are plenty of companies offering really good prices .
Personally,I use about
300 mls together with about
half a cup of Epsom salts,I find this works best for me.
At the moment I'm using Epsom salts which cost 19.99 euros for 5 kilos,also premium grade .
50% sounds very strong,I would think you have to be very cautious with the dosage,we don't want you turning albino on us
I think a bit of arithmetic is called for if you're trying to work out 300mls at 3% OR ............ at 50%.
I do hope I haven't confused you,sometimes I have this effect on people!!!!!!
Tickled