I had all of the equipment on the pool replaced this year (filter and pump). The inline chlorinator was replaced with a IC40 SWG and that's when the problems started. SWG wouldn't turn on, flow indicator. Several visits from the Pentair rep and reconfiguring the plumbing, it became clear that the problem is underground lines.
The suction line kept losing suction intermittently and switching the diverter valve to use suction side only filled the pump basket with air. In addition the pressure on the filter was showing above 25 at around 3000RMP on the pump.
The pool company said that it looks like I have flex pipe underground and it looks crushed. What they did was disconnect the skimmer and the suction from the pump, and threw a line over the deck into the water. Same problem. So they put both back, and tried the same with the return side. All problems went away immediately. No air in the basket, pressure down to ~10, SWG is running perfectly.
They are advising to replace the return lines, and since the way the digging would have to be done, replace the suction as well since they'll be passing that spot anyways.
Original plumbing is 1.5" and I'm asking them to replace with 2" pipes. The only thing that worries me at this point is when I asked them Sch 40 PVC or a roll of poly, they are recommending to go wit poly for a few reasons:
1) no joints as the can reach each point with a single roll.
2) not as susceptible to ground movement
3) the trench doesn't have to be as "nice" and flat as it would have to be for the rigid PVC, which translates into a lot less $$$s
Does any of this make sense, or should I insist on the ridging Sch 40 PVC?
Thanks in advance.