Yes household peroxide is fine just use a 5% mixture and you are fine.

It's good practice to use it every other water change durning the Veg cycle but not as important once they are into flower. By then the root should be developed and healthy.
Zandor Reviewed by Zandor on . supplementing hydrogen peroxide when using h2o2 can I just use the regular household peroxide? and when suppementing how much do I use per gallon? how often? Rating: 5