Average Joe said:On the freshwater pump there is a screen-type filter on the inlet side that gets clogged up with algae, etc. Unscrew it, clean the filter and replace it. Don't know about the saltwater unit.
At least the fish got some air.fullphase said:well I got it working! turns out whomever did the latest install of the pump reversed the inlet and outlets on the pump.....therefore it was pumping air into the ocean!