I am using General Hydroponics three part along with a cap mag supplement and liquid mycorrhizae but I would like to mix in some H2O2 to keep lines free of biofilm. Can you provide some direction for that application?
I would advise that just GH 3 part is necessary, it is one of the cleanest liquid fertilisers around. No need to add the Cal Mag, liquid mycorrhizae, your just asking for trouble. Keep it simple and just use GH 3 Part.