Pressure Testing

poolboyK

Well-known member
May 19, 2024
51
Hempstead, NY
Hi, I have a 20x40 inground vinyl pool. This past summer, I realized that we may have a leak. About every 1.5 weeks, I would see the water level fall from mid skimmer to the level of the lowest screws on the face plate, necessitating dropping a hose in to get it up. Around last September before we closed, we had a leak detection company out. They found numerous pinholes in our liner (about 15 years old, we bought the house in 2020). The pump was still on after the repair, but I did see the water level drop. It was closing time so we said we would investigate later. The last month or so I've been checking the level and it hasn't fallen while the pool has remain closed, so I assume if it only drops when the pool is running, it may be the plumbing.

The leak detection company had told us they don't plumbing tests and that we'd need a pressure test. I scheduled one with my pool company, but upon asking what the remedy would be if a leak was detected in the line, they stated they would replace the entire line. I tried asking why they couldn't just repair the area where it was leaking and they said that when they first started, they did it this way but it was tedious and that if a leak was in one part of the line, it's possible another part could be faulty too. I expressed concern that I'm not sure I can afford a full line replacement, and they tried to assure me it won't be bad if needed. I am also getting my liner replaced this summer by a builder who has really good reviews, and that company also said they do not individually repair the area if a leak is found.

1. Is this standard procedure? Ive seen so many videos where leaks in plumbing lines are repaired wherever the leak is. I'm in Long Island NY. Or should I look for a company who will be willing to find a leak and repair the leak in the plumbing instead of replacing the entire line.
2. Would you have the company replacing pool liner do the pressure test? I won't be getting the liner until July, but am opening in mid May, so I was thinking perhaps the company who opens and closes for me can do it when they open (this company doesn't install liners).
 
mid skimmer to the level of the lowest screws on the face plate
This is your biggest clue. If this dropped to this level, but did not drop in the skimmers, it is not plumbing. It is likely the seals around the skimmer plates.
I don't thing you need pressure testing, unless the skimmers drained also...maybe but not likely.
about 15 years old
This is VERY good run for a liner. The skimmer plate seals have just failed.
You have a couple choices. You could have someone come and replace the seals on the skimmers and be good until July.
Or, let it run to July. The risk of running to July is just the water loss, any erosion under the deck due to the water, and damage to the liner walls.

I'd get the liner replaced and make sure proper seals are installed on the skimmers. If you still have a leak, then go to a detection service.
 
This is your biggest clue. If this dropped to this level, but did not drop in the skimmers, it is not plumbing. It is likely the seals around the skimmer plates.
I don't thing you need pressure testing, unless the skimmers drained also...maybe but not likely.
I went back to my messages with the diving company who patched the pinholes. Essentially, they repaired on a Monday October 14, and by Friday October 18, the water level had fallen the width of an entire faceplate screw (pictures below, the one at night was the after photo). The diver did mention it could be a gasket and to keep an eye on the water. Around November 10, I saw that one of the skimmers was bone dry, with no water at all (picture attached). The other skimmer did still have a very low level of water in it. At this point, I contacted the company who does my opening and closing and they said that a gasket repair could be tricky as my liner was old and brittle, therefore I'd have to sign a waiver if I wanted the gasket to be replaced incase anything went wrong with the liner. That is why they recommended getting pressure tested.

I was extremely overwhelmed and busy so I let the situation be. In March, I started having companies come out for liner quotes. I also had my looploc solid cover with drains fail on me, and I replaced it with a new looploc solid cover w/no drains. When my cover ripped in February, there was water in both skimmers, I assume due to the mesh letting the water in. However, ever since getting a solid cover, I kept an eye on the water level in the skimmer and saw that it has not gone down at all. Overall I feel really confused by all these different clues.
 

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