High buddy, i have done one successful DWC grow but i used tnc mycorrhydro beneficial bacteria to keep my root zone in order... i also used advanced nutrients voodoo juice and sensyzyme.... from what i understand if you use h202 then you need to add it to the res every couple of days as it depletes after a certain amount of time... as i said though i prefer the beneficial bacteria route myself, and this stuff stains your roots a brown color as do some feeds.... the main issue is that the bennies clog airstones, at least the tnc ones do and this can cause lack of dissolved oxygen in the rootzone, so make sure you clean your airstones regular and you will be fine i had temps in the buckets up to 26c and still hit over 1gpw, every time that i get an infection in the roots the bennies kicked its arse into next week.. happy days..
but either use one or the other, you cant use bennies and h202 at the same time... i use bennies in every grow now, they are the dogs bollox mate and i would not grow without them... i now use the full advanced nutrients range of beneficial bacteria and this is how i use it with autos..
voodoo juice from the start, and when i pot up the seedling in its cube i put about 5ml piranha in the hole and a bit over the roots coming out of the cube...
carry on with the voodoo juice and when you see pistils start adding piranha and tarantula along with the voodoo for another 2 weeks, then stop them three and just use sensizyme for the rest of the grow... i use bud candy as a carb source to feed the bennies and this method is working very well for me at the moment...
IJ
- - - Updated - - -
also forgot to add... you dont need calmag if you let your ph drift.... its all in the feed so just make sure you let your ph drift through the whole range before resetting it... what i do is have the plants on a slightly lower EC than normal and set the ph at 5.5, then as the plants feed the ph drifts up and when it gets to 6.1/6.2 i reset it back to 5.5 that way it gets what it needs as all the nutrients have been made available, you will also notice you use less feed this way....
IJ
- - - Updated - - -
also forgot to add... you dont need calmag if you let your ph drift.... its all in the feed so just make sure you let your ph drift through the whole range before resetting it... what i do is have the plants on a slightly lower EC than normal and set the ph at 5.5, then as the plants feed the ph drifts up and when it gets to 6.1/6.2 i reset it back to 5.5 that way it gets what it needs as all the nutrients have been made available, you will also notice you use less feed this way....
IJ