Please help. I have this mass of tiny black bugs near my pool where there is gravel. I tried washing them away and it sounds crazy but its like their waterproof. They are still alive and on top of the water. It looks like someone sprayed black paint???what can I do?

Hard t say without seeing it but it sounds like soil gnats that feed on mold that grows in the soil below the gravel.  A good contact killer sprayed on the gravel will kill the adults.  They will subside on their own however as the soil dries out.

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