So I did a w/c. I raised the water level in teh sump. In the HOB, the part with the drain, the water level went up about 2". This was more that I liked, it could not be allowed to raise n its own. So, grasping a straws I yanked the air line that went down the tube out. The water level dropped to even with the drain pipe. So I put it back in. The level rose to the point were I shut off the pump! I will put it back were it was ( or close as I remember ) and see.