My father has a grinder sewage pump to get sewage from his basement up into his sewage tank. A garbage disposal, dishwasher, high efficiency washing machine, and a toilet (that doesn't get used very often) all drain through it. The basin for the grinding pump keeps getting plugged up with a thick, white, gooey substance that keeps the float from working. His plumber (who installed it) doesn't know why it's happening. He says he's never seen it happen before. Any ideas?