yeah during winter i had a heater come off its suction cups in my sump and came out of the water and exploded i saw next morning when i woke up and i cut off the power and diconnect my sump took it out side and drained it and gave it a good cleaning waited a day hooked a fresh filter sock when i had one and went through and blasted everything with a turkey baster and let the overflow do its thing then repeated after cleaning the sock went through again with turkey baster and did a 15% water change. may have been a little much but just gota be safe because you never know.