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Spa Jet Basics

Spa Jets Explained:

To troubleshoot spa jet problems it is helpful to understand how they work. The diagram in Fig. 1 shows the layout of a basic venturi tee for mixing air and water. Pressurized water from the pump is fed in through the water inlet drawing with it air through the air inlet which is open to the atmosphere or connected to an air blower. The air and water mixture exit from the front of the jet giving us the hydrotherapy action we all enjoy.

Where spa jets go wrong:

Many modern spa jets are not as simple as the older venturi tee style. In most cases the orifice is mounted in a removable "internal" assembly.

Illustrated in Fig. 2 is a typical jet internal, this internal mounts inside a "jet body" in the spa wall. The water inlet is at the rear of the jet internal and the air intake is through the slot in the side of the internal assembly. The orifice is inside the internal where it is not visible in the picture.

Near the back end of the jet internal is a black seal ring. When tightened into the jet body in the spa, this black seal ring will separate the high pressure of the water inlet from the air intake which is sucking in the air.

All jets have some sort of separator keeping the water pressure out of the air lines. When this separation no longer works correctly the pressurized water can leak into the air suction section. The pressurized water in the air intake can limit the amount of air in the jets making them feel less powerful. If the leak is large enough it can disrupt the flow or air to surrounding jets or even start leaking out of the air controls up above water level.

How do I fix it?

On most jets there are limited parts available so a replacement of the internal is the most common remedy. You can find jet internals and replacement parts in our replacement spa jet section.

If you do not see your jets in the jet section or cannot identify them, please email a picture of them to our technical staff at: [email protected]. We can normally help you identify your jets.