i have a 180 gallon with a 60 gallon sump i have a lifegaurd aquatics 4000 pump on it for return. getting around 6 to 800 gph through sump. i have two corner overflows with i think 1 and a half inch drains and 1 inch backups. they were handling it no problem no water buildup in overflow. i added another pump idk the brand or gph but its very STRONG i would guess 1,500 to 2000 gph and the overflows seem to handle it fine there is a buildup of water about 4 inches in one and the other has none any chance they could all of a sudden not handle it and flood me?
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