THE USES OF H2O2
The most popular use is sterilizing hydroponic reservoirs. 2ml of 3% solution per liter of nutrient solution in your reservoir will do the trick and keep it sterile for around 4 days. The big plus for using H2O2 is also the extra oxygen molecule that gets released into your water.
The same 3% solution is needed which we then add 2-3ml per liter to spray on the leaves of the affected areas. When flowers or fruits are almost ready to harvest the last thing you want to do is spray chemicals. But with H2O2 all you’ll be left with is water with extra oxygen.
The last use for H2O2 is taking care of pests. The usual 3% solution is still advised and like with the mildew, 2-3ml per liter in a spray bottle. Repeated use is also recommended. For fungus gnats, spray your solution on the surface of your growing medium every couple of days.