Usually for cleaning out pipes etc.For spot treatment of BGA I use 3% from Boots. Works fine and starts fizzing after about 3 , what are yours plan for using it ?
Really? What's it oxidising when the bottle is closed?... once opened and regularly opened after that a bottle has a shelf life of about 1 month ...
Sorted. Ta.Just found this which will be the one I get next
http://www.superdrug.com/Care/Hydrogen-Peroxide-Solution-9%---30-Vols---200ml/p/225338
At the outrageous price of £1.15!
Good question, i have no idea i just noticed myself one day with an older bottle still having a dose left i used it and saw it didn't do much anymore. Looked closer to the bottle and it says "After opening 1 month shelf life".. After that i kept noticing it that it indeed slowly gets less active to older it is.. Probaly moist air contact in the bottle after use is enough to slowly deteriote what's left in there. Evaporation? Mixing? Must be in the air that's the only thin replaced after use.. . So could be 9% is still 3% after a month and good for use, dunno never used it in large quantities, i only use the 3% small bottle..Really? What's it oxidising when the bottle is closed?