You'd have to check what your local rules, they vary widely from one place to another.
But my 'guess' is probably not. If you are allowed to use grey water, most places require that you apply it below the surface, usually in a mulch pit, etc. They almost never allow it to be applied to the surface and especially not in a puddle or pond, not without being treated first.
The glass is neither half full or half empty. It is too big. But this tiny ad is just right:
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