A 1" drain might not be very much depending on how far it has to travel or if there are any bends or spots where it needs to travel horizontally. Also it could be that there is a snail crawling near the drain. Can you post any pictures of the overflow setup and the pipe?
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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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