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Thread: Hot tub water level dropping (hot tub + pool connected)

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    Join Date
    May 2014
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    Hot tub water level dropping (hot tub + pool connected)

    Hello!
    I am looking at getting rid of my pool guy and doing the work myself.
    One of the first things I want to address is the water level in the hot tub drops when the pumps are off. This was not always the case - it has been happening for the past few months.
    The pool guy is no help (one of the reasons I am ditching them!) so I am hoping someone on here might give me some pointers on troubleshooting the problem.
    Thanks!!
    Nick

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    JasonLion's Avatar
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    Re: Hot tub water level dropping (hot tub + pool connected)

    Welcome to TFP!

    Usually this is because of a bad or clogged check valve on tub spa return line. Hopefully you have the kind of check valve that can be opened and serviced.

    There is also a small chance that it is instead a problem with one of the three way valves that switch between pool and spa mode, though this is much less likely.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: Hot tub water level dropping (hot tub + pool connected)

    Thanks for the swift reply Jason.
    The first thing I need to do is identify all the components in the system and get a schematic drawn up so I can figure out what's what....is there an easy way to identify this check valve?
    Also, any idea where's a good place to look for "common" pool/spa schematics drawings so I can have a baseline to work from?

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    JasonLion's Avatar
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    Re: Hot tub water level dropping (hot tub + pool connected)

    This diagram is a good place to start. Though few pools look exactly like that, most tend to follow that basic pattern.

    If you post some photos of your equipment pad we can probably help you sort things out.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: Hot tub water level dropping (hot tub + pool connected)

    We have the pool with two sets of fountains and the hot tub so there a few more lines than shown here, and like you said they are all different, so yes, when I get time I will take some time to figure out what I can then post my thoughts for you guys to look at and give me your thoughts.
    Looks like I stumbled on a great resource here at TFP!! Thanks again Jason!

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    Re: Hot tub water level dropping (hot tub + pool connected)

    Would also help if you could describe any elevation differences between pool equipment, spa and main pool - if the spa is higher than the main pool, you could be seeing a siphon effect if all the equipment valves aren't internally "tight"
    15K, IG, Sunstone Pearl (pebble) finish, Pentair EasyTouch 8 control system, Pentair IntelliFlo VS pump, Pentair IC 40 SWG, Pentair CC200 Cartridge filter, solar heating - 4th time pool owner

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    Re: Hot tub water level dropping (hot tub + pool connected)

    Mine does the same thing. I've narrowed it down to the Jandy Valve directly after the in-line Chlorinator since I cant locate a check valve. If I leave that open after the pumps shut off it will drain to pool level(normal hot tub water level is ~1ft above pool level). If I close it then the hot tub only drains a few inches. Anybody else have any ideas? I have an old blower that doesn't work and the pvc fitting will rotate on the Hartford Loop. Could this cause air to create a siphoning effect? I have a new one but haven't had a chance to install yet.

    *first time pool owner, less than 1 month*

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