If you take 1 gal of 35% and mix it with 1 gal of distilled water you will have 2 gals of 17.5%^
Never used H202 ONTOP of plants, always used it as a purge on my FLO N Gro & thats before i put anything in ( in plant systems or brew 5ml).
My question is that if it's a diff brand of H202 ( mine says 29 or 35% h202)
What is THE ML-Per -Gallon's???????? (googled, asked around already :( !)