I am relatively new to wet dry filters. Right Now I am having trouble controlling the flow of my pump. The filter is an Amircale and the pump is an external little giant rated at 1100 gph. For some reason the water levvel in the sump keeps dropping. In the morning ill check the sump and it will be right at the water line. when i come home and check it, its below the water line. I this hapenning because og regular evaporation or is something wwrong with my set up. ill try to get pictures up as soon as possible. Please help me out. thanks.