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Auburntiger
Auburn Fan
BTR area
Member since Mar 2005
10581 posts

Question for in-ground pool owners (water loss)
I have an in ground liner pool that is 3 years old. On Saturday I performed a backwash and rise sequence with my sand filter. On Sunday I noticed the water was low, added more water (didn't think anything of it at the time). Monday after work I noticed water loss again - so I added more water and marked the level. Tuesday afternoon I had 3/4" of water loss in 24 hours and Wednesday afternoon I had 1/2" of water loss in 24 hours (with the pool NOT running) yesterday afternoon I attempted to perform a die test to find a potential leak, no luck.

Has anyone else experienced a similar issue?


Mahootney
Florida State Fan
Lovin' My German Footprint
Member since Sep 2008
8865 posts

re: Question for in-ground pool owners (water loss)
Could be the in ground plumbing.
Leak detection companies will pressure test for you.


Auburntiger
Auburn Fan
BTR area
Member since Mar 2005
10581 posts

re: Question for in-ground pool owners (water loss)
quote:

Could be the in ground plumbing.
Leak detection companies will pressure test for you.




That is what I'm afraid of - how much do they cost on average? Any in the Baton Rouge area that can be recommended?


wickowick
LSU Fan
Head of Island
Member since Dec 2006
40408 posts

re: Question for in-ground pool owners (water loss)
American Leak Detection, I have not used them in a couple of years, but their standard price used to be $400.


Baers Foot
LA-Lafayette Fan
Louisiana Ragin' Cajuns
Member since Dec 2011
2162 posts

re: Question for in-ground pool owners (water loss)
Yea, it's still $400. Could also be a conduit leak behind your light fixture if you wanna unscrew your light from its niche and do the dye test where your conduit line comes in from. Also main drains can leak too, there are Youtube videos of a guy checking his main drain for a leak.


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HubbaBubba
Oklahoma Fan
Denton County, TX
Member since Oct 2010
28820 posts

re: Question for in-ground pool owners (water loss)
Shut pool down. Turn off all valves leading to pool filter. Wait a day. Check water level. If it does go down that much again, it's most likely a leak at your skimmer(s) not underground. Drain pool below the skimmers, let dry for 24 hours, then use sealant and reseal everything.

If that works, great. If not, get a leak detection service.

So if you shut the valves off and the pool doesn't leak, then you likely have a bad seal on the backwash valve. Close your return lines from the pool to the filter and the line going from the filter to the pool. Pull out your backwash valve and replace the O-rings. Use lube and reinstall. You should replace those every few years anyway.

Voice of experience here. Over 25 years with a pool.
This post was edited on 8/22 at 12:06 am


TBoy
Notre Dame Fan
Kalamazoo
Member since Dec 2007
12689 posts

re: Question for in-ground pool owners (water loss)
quote:

So if you shut the valves off and the pool doesn't leak, then you likely have a bad seal on the backwash valve.


This is great advice. It’s also possible that during the backwash, something got stuck in the seal, causing it to have an opening. Run some more water through backwash and rinse to see if that clears it. Since it happened right after a backwash, possibilities related to that process should be excluded first.


MightyYat
LSU Fan
New Orleans
Member since Jan 2009
18598 posts

re: Question for in-ground pool owners (water loss)
Do you know if water is leaking out of your backwash line? The spider gaskets wear out in the multiport valve and you may have a slow leak there.

It could also just be environmental. If it's been particularly windy and/or less humid lately that will cause quicker evaporation.

I'd start with the bucket test first before calling out the leak detection service.


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HubbaBubba
Oklahoma Fan
Denton County, TX
Member since Oct 2010
28820 posts

re: Question for in-ground pool owners (water loss)
Good advice.


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REB BEER
Laffy yet
Member since Dec 2010
11051 posts

re: Question for in-ground pool owners (water loss)
quote:

Pull out your backwash valve and replace the O-rings. Use lube and reinstall. You should replace those every few years anyway.


Mine was losing water earlier this summer and I figured out it was the spider gasket needing to be replaced. I ordered one and installed a 2" ball valve on the backflow line. I haven't even replaced gasket yet since the ball valve is keep the water from leaking out.


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Auburntiger
Auburn Fan
BTR area
Member since Mar 2005
10581 posts

re: Question for in-ground pool owners (water loss)
First off thank you all for the tips and the advice, I do appreciate

Well... it does not appear that the water is leaking back through the sand filter via backwash. I disassembled the piping coming out of the sand filter from the backwash, no water has been leaking out of there. Also I have no water leaking from any of the seals or any of the piping, on the pump, or filter

I performed a Dye test in the pool myself, it did not come up with anything leaking that I found.

Could it be that I am just experiencing that much of evaporation? The last few days the water loss has not been consistent, anywhere between 1/4 inch and 3/4 of an inch within a 24-hour. We do live in a very hot and humid climate in south Louisiana and this past week has been extremely humid.

Edit: also thanks to those who provided me with an estimated cost for American Leak Detection. I had no idea how much a leak detection service would cost, so I do appreciate it
This post was edited on 8/24 at 12:52 pm


Whatafrekinchessiebr
somewhere down river
Member since Nov 2013
887 posts

re: Question for in-ground pool owners (water loss)
quote:

estimated cost for American Leak detection.


We had them come out in June and they charged $500.00 for the inspection and $125.00 for a very poor repair job. They did label all of my equipment and do thorough testing so I would recommend using them for testing, just wouldn’t pay them to do the repairs.

Before I dropped that $ I would definitely perform “the bucket test” to confirm the water loss is not due to evaporation. From everything I read and the advice I received on here, a 1/2-3/4” of an inch is pretty common for South La.

quote:

has been extremely humid.


You should actually see less evaporation for humid days, water will drop much faster on days when the humidity is lower.

Good luck with the leak, I am still dealing with mine that was discovered a couple of months ago.


lsu1980
LSU Fan
Member since Feb 2007
1970 posts

re: Question for in-ground pool owners (water loss)
I don’t think I have ever lost more than 1/4” in a day before here in south Louisiana under any conditions in 23 years.


Auburntiger
Auburn Fan
BTR area
Member since Mar 2005
10581 posts

re: Question for in-ground pool owners (water loss)
quote:

Good luck with the leak, I am still dealing with mine that was discovered a couple of months ago.


If you don't mind me asking, what kind of pool do you have? Where was your leak discovered? How much water were you losing?


Whatafrekinchessiebr
somewhere down river
Member since Nov 2013
887 posts

re: Question for in-ground pool owners (water loss)
We have a gunite pool with spa.

I created a thread a few months ago.

The skimmer has some hairline cracks but the majority of water loss is coming from the spillway from the spa into the pool. Overtime water has eroded the grout below the spillway which is allowing water to escape behind the bricks.

I was losing anywhere from 1.5-3” every day. Since we located the source of the leak I have been able to reduce the amount of loss by running the pumps less and minimizing water flowing over the spillway.

I have been trying to get the original pool builder out to give me an estimate to repair it right but they seem to be giving me the run around.
This post was edited on 8/25 at 8:40 pm


Whatafrekinchessiebr
somewhere down river
Member since Nov 2013
887 posts

re: Question for in-ground pool owners (water loss)
quote:

I don’t think I have ever lost more than 1/4” in a day


Based on what I read online and what was posted in the thread I started it sounds like evaporation can vary based on a ton of factors...size of pool, location, shade, water features, etc.

Which Is why I and others have said the first course of action should involve ruling out evaporation as a factor and the best way to do that is “The bucket test”.


Auburntiger
Auburn Fan
BTR area
Member since Mar 2005
10581 posts

re: Question for in-ground pool owners (water loss)
Oh wow, you and I have totally different pool systems. I have a in-ground liner pool (no spa)

quote:

Which Is why I and others have said the first course of action should involve ruling out evaporation as a factor and the best way to do that is “The bucket test”.




How accurate is the bucket test?
I saw that there are a number of variations for the bucket test. I tried it by filling a 5 gallon bucket with water, had it next to the pool on the concrete. I found that the results were inconclusive.

Is there a particular bucket test method that you found is most effective?
This post was edited on 8/25 at 9:37 pm


MightyYat
LSU Fan
New Orleans
Member since Jan 2009
18598 posts

re: Question for in-ground pool owners (water loss)
The best way to test with the bucket is to put in on the first step so that water temp is the same. YOu mark the bucket on the outside where the pool water meets and then you mark the inside where you fill it up to. See below.

Image: https://raytekleakdetect.com/wp-content/uploads/2015/09/bucket-test.jpg


Auburntiger
Auburn Fan
BTR area
Member since Mar 2005
10581 posts

re: Question for in-ground pool owners (water loss)
I tried the bucket test (multiple times through a few different scenarios)...test indicates a leak.

I'm trying one more thing before I make a call to a leak detection company. I pulled the multiport handle from the sand filter, noticed a few "worn spots" on the spider gasket. I'll replace the gasket...cross my fingers (but I'm not holding my breath)...


REB BEER
Laffy yet
Member since Dec 2010
11051 posts

re: Question for in-ground pool owners (water loss)
I’m pretty sure the spider gasket isn’t your problem if it’s losing water with the pump not running.


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