Pressure in RO membrane won’t go to zero when flushing.

[Dabber]

I’ve got a 4021 system which has been working fine. Over the last few days when I fully open the gate valve to flush the system the pressure won’t drop to zero but drops to around 10. Any ideas why this might be happening ?

 

[ched999uk]

That would suggest that there is a restriction in there somewhere or maybe membrane is clogged up? I would check all pipes, maybe one has been squished, then pipes off the the valve and see if it's clear?

 

[Dabber]

It was a kink in the waste hose which was hidden in the undergrowth. Not happened before but appreciate the advice ?

 

[ched999uk]

Great that you sorted it and another good reason to have a pressure gauge.