I'm not an expert on pumps but let me ask a few questions.
Does it make a humming/buzzing noise when the power is on?
When you checked the impeller were you able to turn it by hand? Did it feel smooth or tight and or grinding.
The grinding sounds like a bearing, this shouldn't have anything to do with the filter or the deep cleaning of it.
Does it make a humming/buzzing noise when the power is on?
When you checked the impeller were you able to turn it by hand? Did it feel smooth or tight and or grinding.
The grinding sounds like a bearing, this shouldn't have anything to do with the filter or the deep cleaning of it.