I might consider doubling up the mesh over the overflow (if you're using gutter guard... if not using gutter guard, then I might consider using gutter guard).
Plastic window screening is safe to use wet in your tank, but I think you will find it will clog easily and cause overflows if you're actually straining water through it.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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