I use 2ml/gallon with the 35%.....use carefully cause that's strong stuff. I would DEFINITELY wonder why your ph would change so drastically when adding it.....hmmmmm.

I've heard it lasts about 24 hours....but I've personally seen the effect hang on longer depending on air circulation etc....
Good luck.
Weedhound Reviewed by Weedhound on . Rinsing root system with H2o2 solution When I mixup a solution of H2O2 and water the Ph lowers to 3.2. Should I bring up Ph to normal levels 5.2-6.0 or should I leave it at 3.2? Will H2O2 solution work if Ph is raised? Rating: 5