I have a problem with flow through my Pentair SVRS and FNS 60 filter setup. Everything has been OK until a few days ago when we noticed that the flow light on the SWG was red. Flow through skimmers was minimal and output from returns was weak. In addition the pump stopped and restarted several times as if something was blocked
With the multiport set to Recirculate everything is good, so we concluded the filter was the problem, even though psi had only risen 3 or 4 since I did a complete tear-down a month ago.
Backwashed yesterday, PSI was back to normal and flow was good. I only added 4lbs of DE (vs the full load of 6) in case I had somehow inadvertantly added too much last time
Today we have exactly the same problem again with poor flow. PSI has already risen by 2. On Recirc everything looks normal. Water is getting cloudy
Next step I guess is to disassemble the filter and clean again. Any other suggestions ? Do I need to acid-wash the grids? I'm relatively new to this so all help gratefully received
30,000 gallon Concrete pool
Pentair SVRS pump
Pentair FNS 60 DE filter