Spraying Canopy with Hard water?

Started to develope some small powdery looking white spots on the fan leaves (3 week old plants). I can wet my finger and wipe them off pretty easily, but some of the leaves are browning and dying. As far as I can tell it isn't powdery mold or Insects. Could spraying my canopy with hard water cause water spots or mineral deposits? I keep a fan running at all times to prevent mold, so wasn't sure if while the air is being circulated if water spots could develop.

Any advice would rock, thanks in advance.

Those are water spots. Spaying of leaves is done to wash leaves of dust. 1 time before flowering is good.