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Update: The pool store did the pressure test today and the result indicates there is a small leak somewhere in the skimmer line under the ground. But they couldn't locate the exact location of the leak. So for a fix they have to replace the entire skimmer line which would cost around $1k. They...

The guys from the pool store came today and they didn't find any leak above the ground either. They suspect the leak may be under the ground. They will perform a pressure test later this week. I'll post once there is any update.

I applied the Shavy foam to all joints from the diverter to the ground. No suction observed. I still don't understand your answer to (2). Let's exaggerate that a little bit - assuming there is a really big hole(e.g. baseball size) in the diverter skimmer line, then according to what you say I...

Hi satpoolman, Thank you for your reply. However I don't quite understand your answer to (2) as I think it's different from (1). I assume the normal flow is like this: skimmer ---> skimmer line ---> diverter ---> pump strainer ---> filter ---> ... In (2) I block the skimmer with the cap and...

It seems I exceeded my quota. Below are links to the other images: My return line diverter valve: IMG 1003 — imgbb.com My DE filter pressure: IMG 0996 — imgbb.com No bubble in the pump strainer when diverter shuts off the skimmer return line, or when the cap blocks the skimmer hole: IMG 0999...

water level, water level in the skimmer, and the skimmer cap I mentioned.

I called my local pool store today and they said another reason could be that I added too much DE power. So they asked me to do a backwash. Does that make any sense? My DE filter is running at 12~13 psi currently so I don't see the point to do a backwash.

No, there is no vortex. I also tried removing the weir door so that the water doesn't flow too fast into the skimmer. But it doesn't help either.

Hi, My 24,000 sq ft ingroud pool has two skimmers and one main drain and several return jets. Recently I observed air bubbles in both return jet and pump strainer. So this implies the issue is somewhere before reaching the pump(or the pump itself - but I've ruled out the case, see below)...