You can add 15 mL per Gallon of 35%. You can re add every few days or a third a day I believe. Not suggested to use any other grade because its not food grade and actually contains other additives.

USE GLOVES.

BTW, you can use it with the zymes, they are compatible.
herbie the love bud Reviewed by herbie the love bud on . H202 If I have 15 gallons of distilled water, how much H202 is needed with what strengths? Which is best? I am inquiring because I think I have root rot because of abit of green slime at the bottom of my tank and I change it every week so it's not a long term buildup of anything. I also ordered Cannazym, but until that gets here; I have to use other means for now. Rating: 5