make sure if you get an OZONE generator that its OnLY ran inside the room BETWEEN grows DO NOT run it with the plants in the room it will strip the smell and taste as well as the POWDERY MILDEW! This is a good thing to do between grows turn the fan around for a couple days and bring the OZONE to help sterilize every thing and even kill lurking pests just becareful how much you actually run it depending on grow location to living space one noticeable affect of the OZONE is raspy dry throat feeling like your getting a chest cold!! Also feed plants ZONE, Hygrozyme and silica on a regular schedule & foliar feed with this also up till week4 of flowering to help with the PM!! hope this helps!