My pool / spa pump casing cracked when I had it in spa mode, and the leak is bad enough that I need to leave it off. I just cleaned the filter 2 weeks ago and prior to cleaning I had the system in spa mode while sweeping to sweep spa debree into the filter. Immediately after sweeping I turned the pump off and noticed mucky brown water in the basket and pool skimmer. The dirty water cleared up got sucked back into the filter. Can that be related to the pump casing cracking while cleaning the spa this time? What could have caused the pump to crack?