I use the cannazym for the roots and it says the same thing about the h202....something about beneficial bacteria or something....don't ask me.

I don't think I would worry about a small amount of older water....like i say there is always some in mine....even when changing over to bloom nutes or whatever and I've never had a problem. (knock on wood )
Weedhound Reviewed by Weedhound on . First time grow KC Brains Skunk #1 & White KC Hi All This is my first grow seems to be going alright. I did also have some NL during germination & propogation but they all failled to make it to seedlings. WIll have to do a dedicated NL grow with the rest of my seeds as I reckon I know where I made mistakes. These seedlings are about two weeks old and as I say it seems to be going ok but a couple have started to droop a bit since being put in the larger rockwool cubes & te NFT tank. They are under a 250W MH bulb by Solarburst Rating: 5