Sulphur Burners

Yes I am just about to start running a burner in my veg room. The reason is a powdery mildew problem. The only thing I was wondering is I have my fresh water reservoir is in my veg room too. Do I have to cover the water or does it jot matter

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Perhaps if you removed or relocated that water ...your room may not be so humid and the Pm angel would move someplace else ...?