I've been reading and learned form you guys over the past two years. My wife and I purchased a house with an aging pool/equipment so it's been an uphill swim from the get-go. I've managed to do pretty well until things started to go south last week. We are currently in the process of laying new pavers over the existing pool deck so we did have fine brink dust enter the system. I placed a skimmer sock over in the inlet to prevent debris from entering the pump and cartridge. I have inspected and cleaned the filter twice in the past two weeks. Looks very clean with no signs of blockage. We also installed a brand new Hayward heater this season and paid a contractor to modify the plumbing. Everything seems to run fine after the initial install. We started having issues after construction started on the deck.
Symptoms: It is very difficult to achieve prime. I did last night but now the chambers will only fill to 3/4. I've checked for leaks and have reassembled the inlet plumbing several times. I don't see any cracks, leaks, etc. We replaced the strainer cover gasket last year. I've also vacuumed my skimmer inlet to see if I can pull out a blockage. I did pull out several small pieces of stone shavings, but nothing significant. Seems to be plenty of suction at the skimmer.
PSI at the filter is 22. That doesn't change.
My return jets will start out strong but will completely fizzle out within approximately two hours of pump use. I also use a hose to purge the line and everything seems to be wide open. Can't figure out why the jets slowly lose output when while pressure at the filter remains at 22psi.
My brand new heater is now showing a service light with "LO" which apparently mean limit string open. The heater goes into lockout. This has something to do with the pump not pushing enough pressure to flip the pump's pressure switch. After restart the heater will run for several hours before going back into lockout.
So...at this point I'm fresh out of ideas. The pump primed last night but I still lost pressure at the return jets. What the heck is going on!!!!!?
pH - 7.5
CL - 2
TC - 3.5
CH - 375
TA - 220
CYA - 70 (down from 185)
My numbers aren't awesome but I'm also dealing with a lot of construction debris and a lame pump. Tested with TF100 a hour ago.