i plan to use it very soon and i find the 3ml/gal of 35 % are a bit high
you dont want to burn your small roots hairs
heres what i found on growth tech site, for Oxyplus 50 % h2o2
Maximum dose: 1ml of Oxyplus per 5 litres of nutrient solution will give 100ppm of hydrogen peroxide, and this is the maximum dose you can give without damaging the roots. This is the sort of dose that you should use if there is a disease in the roots.
Preventative dose: 1ml of Oxyplus for each 10 litres of nutrient solution. This will give 50ppm of hydrogen peroxide which will help prevent disease and keep the nutrient solution oxygenated.
Sterilizing the system between crops: 1ml of Oxyplus per 1 litre of water. Allow 2 hours for this, and then rinse thoroughly with water.