Quote Originally Posted by xcrispi

Don't ever mix H2O2 w/ hygrozyme or hydrogard though as it'll kill all the benefical organisms in it .
Actually, Weedhound asked her hydro supplier and they said that it was OK to use Hygrozyme and H2O2, but not with Hydroguard. I made that mistake once and ended up with huge slime worms in my bins and res. Nasty stuff. But I have used H2O2 with Hygrozyme by Weedhound's recommendation and it was fine.