Having continued pump problems with my vertical self contained loops. I have had several pumps overheat and lock up. At least eight pumps, usually two at a time. The last time the factory would not cover under warranty do to contamination. The loop water is very black and seems to have an odor. It's a very heavy almost oily substance that will settle to the bottom of a jar. The wells were sealed with ( beninite ???) came in a bag, Clay like substance. Anyone have any thoughts ?