The indoor grow environment can be difficult to control exactly and often becomes an ideal environment for crop destroying fungus or mold called Powdery Mildew or PM. Powdery Mildew and other fungus issues are difficult to control and can overcome even clean well-maintained grow rooms, destroying entire crop cycles. To make matters worse Sates are beginning to restrict the fungicides available to growers, leaving them at risk. Layered prevention is the best way to prevent a PM disaster.