Spa level falls to pool level whenever the filter is off?

Jon Burk

Member
May 1, 2010
12
Howdy pool mavens,

I've got an odd problem I can't seem to solve.

Our spa is above the pool water level by about half. Every time the filter turns off, the spa level slowly drops until it reaches the pool water level (so it's half empty). When the filter comes back on, it fills up the spa and everything is fine.

I figure it has to be some combination of the intake/return valves on the system, but I can't seem to find the right combo. How can I crack the code?
 

anonapersona

TFP Expert
LifeTime Supporter
Nov 5, 2008
2,598
There is a backflow valve that is supposed to hold that spa water level when the filter is off. when that valve is leaking, spa level will fall to pool level. I paid the pool service to replace mine but next time I'd try it myself and save the money, it looked pretty easy.
 

JasonLion

TFP Expert
Platinum Supporter
LifeTime Supporter
May 7, 2007
37,880
Silver Spring, MD
What anonapersona called a "backflow valve" is normally called a check valve. It prevents the water from running backwards through the plumbing.

There are other ways the spa can drain down, but a failed check valve is the most common. Most of them can be opened up and cleaned out without being replaced, which may be all that is required.
 

anonapersona

TFP Expert
LifeTime Supporter
Nov 5, 2008
2,598
JasonLion said:
What anonapersona called a "backflow valve" is normally called a check valve. It prevents the water from running backwards through the plumbing.

There are other ways the spa can drain down, but a failed check valve is the most common. Most of them can be opened up and cleaned out without being replaced, which may be all that is required.
Err, check valve, right!

Coulda been cleaned not replaced.... geez, I wish I'd have known that before I paid them so much to replace!
 

Jon Burk

Member
May 1, 2010
12
Thanks guys! I think I see it (it's got the clear plastic cover on the top, right?). I'll try to clean it out and hope that works. :goodjob:
 

guamguy

LifeTime Supporter
Feb 26, 2010
388
Guam, USA
At least you HAVE a check valve! My pool was built 14 years ago, and when I moved in, there was no check valve for the spa :? . Every time the spa pump was shut off, it would drain down. Now I've got one in there, and all is good :cool:
 

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