H2O2,35% FG, is exactly the same whether used for pools or other, according to one supplier, whom I buy my supplies from. You don't get some things like droppers, but you will get a lower price when ordering pool H2O2. Will name supplier upon request.
I have just tried the inhalation method. I went to a pool store to get Hydrogen peroxide without stabilizers. The only one they had was 27% with water only. So I diluted this to 4 drops to 1 oz. I am happy with the increased energy I feel. I am hoping this will keep my candida under control. I will try the spray every 2 hours. I noticed my appetite has decreased a great deal.