Should I replace my Mag-Drive 7 pump or just buy a new impeller?
I have a Mag-Drive 7 pump in my sump that serves as my return pump. I recently unplugged it to clean the tank and it made a humming noise when I plugged it back in, but it didn't pump any water. I shook it around a bit and it started working again, but it doesn't seem to be pumping as hard. This routine seems to happen whenever I unplug it for maintenance. I examined the impller and didn't notice any problems. I noticed that Mag-Drive advertises that their pumps have low maintenance because there is only one moving part (the impeller). My question is should I buy a replacement impeller for the pump or do I need to buy a new pump altogether?
Also, I didn't notice any obstructions in the return tubing that would've caused a reduction in water current so I'm pretty sure it's the pump...