small, elevated pool draining when pump off

FlaPoolGuy

Gold Supporter
Oct 5, 2019
86
Florida
Hi y'all, I'm having a similar problem to CVTim as mentioned here, but I didn't want to hijack his thread.

Here's my situation: I have a small elevated pool with a spillway into the main pool. When the pump is on, the water shoots out of the single return and fills the small pool. When the water reaches the height of the spillway, it spills into the main pool. However, when I turn off the pump, the water is sucked back into the return and (I assume) drains into the lower pool. Once the water level in the small pool reaches the bottom of the eyeball on the return, the water level stops dropping. I have placed my hand on the return in the small pool, and I can feel the pool water getting sucked back into the return. If I use my hand to cover/block the eyeball on the return, the water level in the small pool stops dropping until I remove my hand from the eyeball. Also, if I turn the valve marked by "2" below, the water stops draining in the upper pool.

I have not been able to locate a check valve anywhere on my PVC piping. Here's my setup:

pool-pump-filter-01.png

Here is the same picture, annotated:

pool-pump-filter-01-annotated.png

The return to the small pool is marked with "2", and there's some evidence of prior repair (blue stuff on the PVC). I do not see a check valve anywhere on the system. I dug down a bit into the ground following the pipe marked by "2", and there wasn't a check valve.

Initially, I was going to see about installing a check valve somewhere near the "2", but I may have found an easier solution. I'm interested in people's opinions on the "eyeball check valve". It's a device I found while searching the internet, and it is something I think could solve my problem. It also has the added benefit of me not having to cut any PVC piping. I would simply unscrew the current return eyeball, screw in the check valve, and I'm done.

Ultimately I plan at some point to remove and replace all the above ground PVC and upgrade the pump, but that's not a "today" project. I just want my upper pool to stop draining every night.

Thanks for your help in advance!
 

Jimrahbe

Mod Squad
TFP Expert
LifeTime Supporter
Jul 7, 2014
22,165
Bedford, TX
F,

I have never seen an "eyeball check valve" but think it would be worth a try in your case...

The first thing I would do is turn off the ball valve by #2 and turn the pump off.. If the upper pool does not drain back, then you have confirmed the problem line and your eyeball check valve idea should work just fine.

Thanks,

Jim R.
 

FlaPoolGuy

Gold Supporter
Oct 5, 2019
86
Florida
Yeah, when I leave town, I turn the valve at 2, and I throw a floating chlorine dispenser in the upper pool, and a separate one in the main pool. The level remains up to the spillway until I return.

I ordered the part. We'll see how well and how long it lasts!
 

FlaPoolGuy

Gold Supporter
Oct 5, 2019
86
Florida
Hey y'all an update. The eyeball check valve is working great! I put some ptfe tape on the threads and "water lube" on the gasket. I've been reading that the valve may only last a year, but $20 a year is a small price to pay for ease and convenience.

Also, the "toilet ring" of green in the upper pool is dissolving since installment.
 
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