Yikes, my sump is leaking due to water pressure and poor manufacturing. I had intentionally been keeping the sump fairly full after assurance from the vendor that these things are designed to be full they claimed that it wouldnèt be a problem. Oh really, well the back seam is splitting. I lowered the water down to about a third, below the internal baffle which is designed to channel the water around. The problem I was facing is my filter would not operate unless the water level is full. By fluke, the channel width is exactly the same size as my filter cartridges. Woo hoo, no more external filter needed!