Low water flow, high filter psi, clean filter....


Well-known member
Nov 23, 2017
Lake Forest, CA
All of a sudden my system has been showing low water flow, slow pool vacuum, high filter psi. Not sure why. Any ideas? There is no air coming out of the return outlet so I am guessing it can't be an air leak...attached is a video. I do have a solar heater on the roof but the valve going up to the roof is closed, and there is a check valve on the return from the roof.


Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
Laughlin, NV
The majority of the time, what you are seeing is from algae in your water.
Can you post a full set of test results?