LoveGrowingIt said:

Nope. Sorry. Water alone doesn't magnify light. It's what might be in water that can cause a problem--usually an oil that keeps the water from beading up on the leaves. Spherical droplets don't burn leaves. The burning happens when the water spreads to form a hemisphere that acts as a lens that in turn focuses light on one, small spot on the leaf. I've tested this many times and have never seen plain water or nutrient solutions appropriate for foliar feeding burn cannabis leaves.

Dissolved minerals can leave a residue that's usually whiteish in color, and there frequently are minerals dissolved in tap water. I don't believe mineral residues are typically harmful. I sometimes spray plain water on the residue to

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