35% is only listed as/for food grade as far as I know, and is the same thing as normal peroxide just way stronger so you dont have to use as much and it lasts longer then normal houseshold (3% peroxide) from my understanding, if im wrong someone can correct me but most sites ive read said 35% does a better job, I just dont know being my first grow and first time using it any input would be greatly appreciated, but thanks alot man for your replies they have helped a lot!!!

P.S. Ill be checking under the hydronton and letting you know when lights are on, I got 3 1/2 hours to go, just need to know how much 35% h202 I should add to my res and if its safe to add with my current nutrients and the hygrozyme, thanks again.