Method to locate a sneaky leak?

Jmen

Active member
Jul 6, 2022
38
Martinsburg, WV
Pool Size
24000
Surface
Vinyl
Chlorine
Liquid Chlorine
Pool is about 40 years old. I have been maintaining the pool (oth than liner replacements (3 so far) for 20 years. it was nice to see the water level about half way up the skimmers when taking off the winter cover a couple of weekends ago. All seemed well after spring equipment resuscitation. Pump started fine, filter got fed DE, bottom skimmed with a net and robot tossed in. All looked fine again when the summer cover was rolled out eight hour later.

Saturday seemed nice enough to try a bit more serious cleaning. The pool water was fairly clear - I was thinking thank goodness no heavy brushing to the tune of Song of the Volga Boatmen.

Then it struck me that the water level was below the lip of the scupper. A run down to the equipment pad did not reveal any significant leaks. One union had a small drip but surely didn’t drain down hundreds of gallons over a couple of weeks. We had other things to do and by the time we returned home it had started raining. I put some painters tape at the water level to see if the leakage had stopped.

Sunday morning it was discovered that the water level had dropped another 3/4”. It occurred to me that the pool seemed to hold water over the winter so perhaps the liner was fine. I plugged scuppers and returns and refilled to 1/2 way up the scuppers, again marling the water level with painters tape.

Monday - water level was maintained thank goodness. What might be best steps to take next? If the shell isn’t leaking and there is no evidence of leakage around the exposed pipes or equipment, then that leaves underground pipe? At the equipment pad there is only a single suction and single return pipe coming out of the ground. There are two scuppers and two returns in the pool, so I can open either the return system or the suction system.

Assuming that one or the other will be identified as the compromised system, what might be a good strategy for affecting an underground repair?

Thanks in advance for sharing thoughts.
IMG_0089.jpeg
 
wait - leak had to be in the return system if level dropped below skimmers - duh! Still need plan of attack for underground piping - pressure test?
I’d fix your leaking fitting before doing any serious changes. Drips add up to quite a bit of water over time.
 
Thank you for the reply. Minor tightening of the union stopped the slow drip. Currently have had no notable loss of water in the shell with both scuppers and returns plugged over 48 hours.

One of the scupper gizmos was removed today (Tuesday) around noon. intent is to check water level in the pool this evening. If no appreciable water loss via the scupper to pump piping by tonight, then I plan on removing the return plugs tomorrow morning.

We are expecting close to 2” of rain this weekend, so no testing over the weekend but it should be possible to makeup water losses - hopefully that won’t be needed though.

Joe M in WV
 
Wetness was found around the pool pump. The pump is about three feet below the pool water level. A seal Kit has been ordered for the ancient Hayward 1hp Superpump. We have had a replacement pump on hand for six or seven years just in case, and will try That if the existing Pump cannot be repaired economically.

Regards,
Joe M in WV
 
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