My 5ltr of 12% peroxide lasts me about 6 months filling my Oxydator A every week. I can't say I have ever noticed it degrading in that time.
Years ago I used stronger stuff which we bought in 25ltr that is used to clear algae in swimming pools that had stabilizers added. However we didn't keep much in the way of SPS then but we never noticed any issues using it.
Years ago I used stronger stuff which we bought in 25ltr that is used to clear algae in swimming pools that had stabilizers added. However we didn't keep much in the way of SPS then but we never noticed any issues using it.