Hot Tub Leak Repair

Having a leak in your hot tub can be a real pain, especially if you don’t know what you’re looking for and how to find it. Following a few simple steps, you should be able to find the source of the leak and be able to decide how to proceed with a repair, without a lot of headache.

Before beginning your search for a leak be sure to disconnect all power to the hot tub. Once you are inside the equipment compartment, most leaks can be sourced to certain parts of the tub such as:

  • Pump Wet End Seal

  • Heater Assembly Manifold

  • PVC Plumbing Parts and Tubing

  • Jet Bodies

  • Slice and Gate Valves

  • Connections

  • Pump

Once you are in the equipment compartment the first place you will want to check is the pump, often a bad pump seal can be the cause of the leak. If you find the water to be leaking from the pump you will want to determine whether just a new seal is needed or if the entire wet end should be replaced. Replacing your entire wet end may save you a lot of headache as new seals can be somewhat difficult to install without breaking them or other components within the wet end.


You will want to check all of the union fittings located around the pump and the heater. Even in brand new spas unions can become loose due to vibrations during shipment. Do not use a wrench to tighten hot tub unions. Unions should be fairly simple to tighten by hand, if not you may need to remove them realign parts for a straighter fit and then tighten by hand. Do not use a wrench to tighten hot tub unions.


Your heater assembly manifold consists of your heater assembly, pressure switch, and other components of the heating unit. If you find the leak to be within any of these parts you will need to proceed with replacing the necessary parts.


Next, check all valves in your hot tub as they can be a common source of leaks. On knife style valves, there is a gasket between the two halves that are bolted together that could be causing leaks. Also, some manufacturers build hot tubs with valves installed on either side of the pump so that water does not need to be shut off to allow access to the pump for repair or replacement. In theory the idea is a good one but often owners will choose to remove these valves as they are a very common source of leaks and can be more of a headache than they are helpful.

Connections and Jets

At this point, if the source of the leak has not been located you will want to move on to checking all of your jets, pipes, and connections. Leaking jets can be caused by a bad gasket in the jet body but it is also possible for jets to go bad overtime and they may need to be replaced. When checking connections they may need to be tightened or resealed with PVC glue.

If you do not want to tear into your equipment and spend the time and headache of trying to locate a leak, a great first step repair option is Fix-A-Leak. Fix A Leak is blended concentrated material designed to seal leaks in virtually any material and can be applied for leaks in the shell and works equally well in the plumbing. It is made specifically for hot tubs and can fix leaks up to 1/8” in diameter.Trying Fix-A-Leak first may save the headache of trying to locate the leak in your equipment, if the use of fix-a-leak as directed does not work you can then proceed with the above mentioned steps in attempting to find the leak.

Fix-A-Leak is very simple to use, just complete the following steps:


1. First determine water loss in a 24 hour period
2. Fill to original level, mark water line
3. Remove all cartridges or filtering devices
4. Slowly add Fix A Leak with pump running through skimmer
5. Recirculate for 6-8 hours. Shut system off
6. Check water level the following day
7. If level remains the same the leak has stopped
8. Allow 48 hours before resuming operation
9. It's recommended not the use spa till leak is fixed and the remainder of Fix A Leak is filtered out.

If Leak has slowed and not totally stopped you may add more product to increase strength of solution already in spa.

Stir Fix A Leak in the spa with soft broom to get solution back into suspension.

Follow steps 5-8 as before.

Product Note:
Normally Fix A Leak will seal holes 1/8" in diameter. The product requires pressure to ensure it's impacted into the area of the leak. Leaks created by a crack in a pipe in all probability will be sealed. The leak may reoccur due to vibration which in turn will migrate in size, recreating the leak. Most spas are foam insulated, and when saturated with water, will greatly delay the cure time of Fix A Leak. It would be best to drain spa, immediately wipe down shell with a damp cloth to remove any residue of Fix A Leak. Allow 3-5 days before refilling, in most cases this will allow the product to cure.
Spazazz RX Spa Aromotherapy


May 2, 2013

Hi Ralph,

In most cases, the fix-a-leak works very well and you may have to use a bottle of it every year or two if it appears that the leak starts again. It is a much cheaper, yet still effective way of fixing most leaks. But… If you really want to get down to the root of the problem and replace the plumbing, then you will have to dig out the foam (if it has any) and start looking for where the leak will come from.

The most difficult aspect of repairing a leak is that you should have water in the tub, so that you can see a water trail or a place in the plumbing that is dripping. If you prop the tub up or tip it on its side to get into the bottom, you can’t have water in there. Unless the damage is very noticeable, you may have a hard time finding the leak. I would recommend giving the fix-a-leak a try. It will hopefully work and it only costs $15 for an application. Here is the link:

May 22, 2013

We did not properly clear all of the water out of our lines this winter and now have several (8 or 9) tee joints leaking. Some of the jointsdo not have enough tubing between them to resection and glue. Will fix a leak be an appropriate solution to this issue? Thanks! Sharon

May 1, 2013

Have a leak in my hot tub opened up the service panel found a dead rat and many glued that they had been in there for a while. Have a leak that I don’t know were it’d coming from becouse it seems to be at the bottom wear I have no acsrss what’s my nets move

May 1, 2013

Ralph, if you are looking for the fastest and easiest fix, I would recommend trying Fix-A-Leak as mentioned in the article. If you use it as directed and the leak is not fixed, proceed through the steps of checking each piece of equipment to determine where the leak is coming from, then that part/ fitting will need to be replaced, but often Fix-A-Leak will take care of the problem. We have had other customers refer to it as “liquid gold”, but again it does not cure all leaks just depends on the size and nature of the leak, but it is a good starting point. Please let us know if you have any other questions.

May 1, 2013

Sounds good but even if I use fix a leak it says I might need to replace the fittings . How do I do that when I cant find out where it’s leaking from. Do I just use that as s bandaid.. My quustion id how do u get to the root of the problem. Do I need to jack the tub up to find out where its at or is there something else i can do to find the leak.

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