While my tank is draining w/ the megaflow system is makes a gurgling noise down in the sump. From the Bulkhead to the sump I am running about a 3' pool house ( that what it looks like)
Mine was doing this too. Do you have the durso standpipe? If so, maybe you need to drill a bigger hole for the air to draw in to prevent the overflow from developing suction. Once I enlarged the air hole, the gurgling stopped.
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