Had and ongoing issue with a Mazuma whole house waterfilter from poor backwash pressure to zero, and when it does work it leaves air all around the property with all taps needing to be bled. And recently due to the lack of backwash pressure, the water smells of bad eggs for a few seconds.
The install was a farce from day one, with clean and dirty water mixed after the filtration stage, only for them to reroute the output further down meeting the municiple simply!
Curious, but should the filter come after the pump? As it stands the filter is in between the water tank and pump. So in theory the filter is preventing water pressure from entering the pump, I pressume?