Losing water through deck jets

robertmee

Well-known member
Jun 26, 2015
386
Raleigh
I have 6 Jandy deck jets surrounding pool. This past summer I noticed a couple of them were much lower pressure than the other 4, but since we only use them for larger parties I didn't pay much attention to them.

We don't close our pool but on cold nights I'll run the deck jets and fountains to prevent any freezing. All above ground pipes are insulated and heat taped.

This time when I ran everything, in about 4 hours, the pool level dropped below the skimmer. I have iso valves on the main return, fountains and jets. Through process of elimination I determined the jets are the culprit. For now I blew out the jets with air, and sealed off the valve until we get past the cold spell. The rest of the pool runs fine.

Should I suspect a leak at the two jets that have little pressure? Is it likely to leak is underground, at the cup fitting or the jet ball itself? I didn't see any muddy water or water accumulation on the deck, but did notice when I blew with air, I didn't see any water blow out of those two jets.

I suppose the next step is to remove the cup caps and see if I can any water pooling in the Cup? Beyond that what else can I look at or try in order to diagnose? Is it most common for leaks at the ball, the cup fitting or in the pipe underground. I dont relish the thought of breaking up concrete and would probably have to just abandon the jets.

Any thoughts are greatly appreciated.
 
Can you isolate the jets to determine which ones might be leaking?

A leak detection company may be able to find the leak if the line can be sealed off and pressurized a bit. They use CO2 to pressurize the line slightly and then use sounding equipment to listen for the leak. They can usually pinpoint the exact location to within an inch or two. Sounds like maybe some glue joint did not hold or, if you're lucky, the joint at the bottom of the cup is bad.

You definitely don't want to run them anymore until you get it sorted out. A water leak can erode the soil base under a deck and leave a void behind which can cause worse damage. At the end of the day, it would be better to abandon a bad deck jet than have to remediate a sagging concrete deck.
 
Per the leak test, I suppose I could remove each ball jet and plug the line as if a new install. Reading the install manual this is done during rough in before the jets are installed, so I could plug them all and pressurize the lot.
 
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