Ozone Installation Guide



Please choose a category from the list below
I'm replacing an existing ozonator.
My spa is ozone ready-- I want to add an ozonator.
My spa is not ozone ready I want to install one.
Installing a self contained ozonator-(no plumbing required)
Ozonator Facts
Ozone Troubleshooting Guide

I'm replacing an existing ozonator.

If you are not sure weather your ozonator is working correctly, then check-out the troubleshooting guide for further help.

  1. Turn the power off too the spa
  2. Check the voltage supply to the ozonator, the information may be on the ozonator.
  3. Check and compare which cord end you have. (The ozonator may have been hard wired in)
  4. Install the new ozonator using the enclosed hardware (instructions are included)

My spa is ozone ready--I want to add an ozonator.


Electrical Requirements:

All ozonators are supplied with power cords and are hooked to the equipment control box via a supplied cord end, or they are hard wired directly into the control box. Look on the side of your control box where everything plugs in, if you see an empty slot that will except a (3) prong plug then most likely this is the receptacle for the ozonator. Please look at the selection of cord end to select the proper pattern.

Plumbing Requirements:

If your spa is 'ozone ready' then one of two things are apparent:

  1. You have located and identified a clear tube (approximately 3/8") that is just hanging in the equipment area with either a knot or plug at the end that is not attached to anything.
  2. You have located and identified a section of 3/4" ID flex hose spliced into a rigid water line, which leads to a special ozone jet in the spa shell. Click for these instructions

(1) If this is the case then the first thing you will want to do is remove the plug/knot at the end of the tube, then start the pump on the low speed filter/heat cycle. Once this is done, you'll want take the end of the tube and check for a slight "suction" or "draw". This can be achieved a couple of ways; you can either put it on your tongue and check for suction, or you can find something very small and light to see if it gets sucked into the tube. If you are getting the suction mentioned above, then the next step is to identify the cord end that matches the receptacle on your control box, then purchase the ozonator that matches the cord end you chose. Spa Parts Ltd. recommends using a DELZONE unit. If the tube is not drawing a suction, then please follow the instructions below. (In the yellow box)

Once you receive the ozonator, find a suitable mounting location that will keep it up and out of any water. The next step is VERY IMPORTANT, failure to do so will jeopardize the new ozonator and void the warranty. You will want to create a "loop" (Hartford Loop) in the tubing and install it as high as possible under the spa to keep water from backing up into the ozonator as shown below.


Water should never be allowed to enter the ozonator! If the existing tubing in your spa is not long enough to create this loop you can purchase a coupling, from any home center to join your tubing to the tubing that comes with ozonator.

An in-line check valve is also included in every ozone kit and should be used.

Please install it per the instructions, making sure that it is installed in a manner the will allow the ozone to be "drawn" through the tube into the spa.

You can now plug the cord into it's power source, depending on the manufacturer of the ozonator you should have an indication of weather it is working or not by either a site glass or a "blue glow" coming from the manifold. It is best to check this at night. Now turn on the filter/heater cycle and take a look in the spa, there should be one jet that is spitting small bubbles. It is these bubbles that the ozone uses as a vehicle to enter the spa water.


(2) If you have located the flexible tube mentioned, then your next step is to order the in-line injector P/N 684K-MAZZEI and ozonator, Spa Parts Ltd. recommends using a DELZONE unit. Make sure you order the proper ozonator with the correct cord end that will match the receptacle on your control box.

Once you receive the injector, you will simply cut out a piece of the flex tube in order to install the injector. (See below) Make sure to install the injector with the arrow pointing in the same direction that the water is flowing.



When Installing the ozonator, find a suitable mounting location that will keep it up and out of any water. Connect the supplied tubing from the injector barb to the ozonator barb. The next step is VERY IMPORTANT, failure to do so will jeopardize the new ozonator and void the warranty. You will want to create a "loop" (Hartford Loop) in the tubing and install it as high as possible under the spa to keep water from backing up into the ozonator as shown in (Figure 1) above. Water should never be allowed to enter the ozonator. An in-line check valve is also included in every ozone kit and should be used. Please install it per the supplied instructions, making sure that it is installed in a manner the will allow the ozone to be "drawn" through the tube into the spa. You can now plug the cord into it's power source, depending on the manufacturer of the ozonator you should have an indication of weather it is working or not by either a site glass or a "blue glow" coming from the manifold. It is best to check this at night. Now turn on the filter/heater cycle and take a look in the spa, there should be one jet that is spitting small bubbles. It is these bubbles that the ozone uses as a vehicle to enter the spa water.


Electrical Requirements:

All ozonators are supplied with power cords and are hooked to the equipment control box via a supplied cord end, or they are hard wired directly into the control box. Look on the side of your control box where everything plugs in, if you see an empty slot that will except a (3) prong plug then most likely this is the receptacle for the ozonator. Please look at the selection of cord end to select the proper pattern. If you do not see a receptacle then you will need to hard wire the ozonator cord into the control box. The electrical cord should be wired to the pump relay or switch so that the ozonator comes on only when the pump is on; for 2-speed pumps, the ozonator should be wired to the low-speed pump relay (NOTE: The ozonator should only operate when the low speed pump is running).

The Concept:

This installation will require taping into the air line via a barbed fitting (see Figure 2 below). This line is plumbed in series from jet to jet and eventually ties into an air control (you may have more then one) that is mounted on top of the spa. While the jets are running you'll notice that if the air control is closed it will not allow air to mix with the water coming out of the jets in the spa. However if you open it, the jets increase in power due to the fact that air being pulled in from the air control is now mixing with the water coming out of the jets. This action is called "Venturi". This installation is going to use the same concept; except, instead of the "mixing air" or pulling air from the air control, it will pull air from the ozonator. Now the air that mixes with the water will have ozone in it and sanitize your spa.

Plumbing Requirements:

For portable spas utilizing the air control

For in-ground spas-- installing an injector


My spa is not ozone ready-- I want to install one.

If your spa has more then one air control, you'll want to "tie" into the one that produces the most air when it is opened. With the pump running on low speed, turn off both air controls, open one at a time observing the air mixture that is coming out of the jets. The air control that allows the most air to mix with the water coming out of the lowest jet; if possible, is the one you will want to plumb into.


  • » If you have more than one air Venturi line, select the one with the best suction, connected to the lowest spa jet if possible (see plumbing requirements above)
  • » Cut the PVC pipe (usually 1") and install a tee, in the side port of the tee you'll need to install a barbed fitting (found at any Home Center) that will except the 3/8" tubing included in the ozone kit. (Fig 2)
  • » Connect a 6" piece of tubing to the barbed fitting, at the other end install the provided check valve. Once this is done, blow into the check valve, the air should flow freely towards the tee, if you feel back pressure when doing this, you have the check valve installed backwards.
  • » Attach a 5-6 foot length of flexible tubing to the check valve and route the hose so that at some point it passes above the water level of the spa. You may need to tie the hose up to keep it in place. This will help insure that no water backs up into the ozonator. (Fig 2).
  • » Before attaching it to the ozonator you should test the line to make sure that it will have an adequate amount of suction to draw in the ozone from the generator as well as making sure water does not back up into the line. You'll need to fill the spa up with water, shut the air control valve off, and start the low speed pump. You should see bubbles mixing with one or more jets. Placing your thumb over the tube should make them disappear. If this is the case, then you have successfully installed the plumbing.
  • » Connect the final end of tubing to the ozonator barb and plug in the ozonator
  • » Systems are either 120 or 220 VAC, 50/60 HZ. For hard wire installation wire ozone generator systems to the low speed side of the circulation pump switch or timer. Follow your local electrical code for grounding and installation procedures for spa equipment.
  • » FINAL NOTE: The mentioned tee can be installed vertically (as shown) or horizontally anywhere in the air control line. However, the closer to a jet you can get the better.

My spa is not ozone ready-- I want to install one.

Systems are either 120 or 220 VAC, 50/60 HZ. Wire ozone generator systems to the low speed side of the circulation pump switch or timer. Follow your local electrical code for grounding and installation procedures for spa equipment.


  • » You will need to purchase an ozone injector for this installation. You'll also need to determine weather the line you are installing the injector in is 1.5" or 2". Use P/N OZINJ1 or OZINJ2.
  • » The injector is installed after the filter/heater make sure that the "flow" arrow is pointing towards the spa.
  • » Connect a 6" piece of tubing to the barbed fitting, at the other end install the provided check valve. Once this is done, blow into the check valve, the air should flow freely towards the injector, if you feel back pressure when doing this, you have it check valve installed backwards.
  • » Once this is done push the provided tubing onto the injector barb. Before attaching it to the ozonator you should test the line to make sure that it will have an adequate amount of suction to draw in the ozone from the generator as well as making sure water does not back up into the line. You'll need to fill the spa up with water, and start the low speed pump. Once this is done you should see bubbles mixing with one or more jets. Placing your thumb over the tube should make them disappear. If this is the case, then you have successfully installed the plumbing.
  • » Connect the final end of tubing to the ozonator barb and plug in the ozonator

Installing a self contained ozonator-(no plumbing required

Electrical Requirements:

  • » Ozone can be delivered continuously, up to 24 hours per day, when wired independently of the spa pump by simply plugging it in into a regular (nema) receptacle. Or you can wire to the low side pump circuit in the control box, for controlled operation.

Installation Requirements:

The self contained ozone generator can be mounted anywhere in the equipment area, or it can be mounted to an outside wall. If you are mounting it in the equipment area, make sure the check valve is installed and a "Hartford Loop" (Fig 1) is installed to prevent water from backing up into the ozonator. If the unit is going to be mounted on an outside wall, place the unit above water level, this will prevent water from siphoning into the ozonator.


  • » Connect a 6" piece of tubing to the barbed fitting, at the other end install the provided check valve. Once this is done, blow into the check valve, the air should flow freely towards the tee, if you feel back pressure when doing this, you have the check valve installed backwards.
  • » Attach a 5-6 foot length of flexible tubing to the check valve and route the hose so that at some point it passes above the water level of the spa. You may need to tie the hose up to keep it in place. This will help insure that no water backs up into the ozonator. (Fig 1)

For temporary or simple installation, slide the ozonator tubing onto the barbed wall fitting and let it hang over the edge into the spa water.


Ozone Troubleshooting Guide

When your spa is in it's "on" cycle a suction of air is being pulled through the tubing from the ozonator to the return line. As the air passes by the UV bulb or chip, the oxygen in the air is converted to ozone. This ozonated air is introduced to the water via an action known as "Venturi". When your spa is in it's "off" cycle water tends to flow back in the tubing towards the ozonator. Therefore, installing the provided check valve and a "Hartford Loop" (see illustrations above) will help prevent this from happening.

Ozone is introduced into the water via the low speed (filter) mode. It is recommended that it runs on a 24 hour cycle, although, it can operate on the timer mode as well. You may have to keep a chlorine or bromine reserve when operating in this mode. The 24 hour cycle mode will not only cut back your chlorine or bromine use, but may replace it all together. It is recommended you use a Non-Chlorine Shock or a Mineral Cartridge such as Nature2 (not bromine compatible) or The Frog (bromine compatible). These three combined will keep your water sanitized and crystal clear.

Gallons Operating Time
Up to 250 4-6 hours
251-500 12-18 hours
Over 500 12-18 hours

Problem Corrective Action
No blue light glowing from ozone unit. Cord or power not connected
Breaker or GFCI tripped -Make sure water has not flooded ozonator
Defective bulb, transformer or chip REPLACE OZONATOR
Flickering blue light Incorrect voltage supply to ozonator -Confirm voltage at power supply.
No bubbles from ozone jet

Air control leaks

  • » Open or leaking air control valve. Check air control cap O-ring, replace if necessary -Relates to air control (Venturi) installations only.

No Suction from tube connected to the ozonator

  • » Check for dirty filter (remove and run spa to see if it makes any difference)
  • » Make sure all adjustable jets are open completely
  • » Check for debris in jets
  • » Check ozone supply check valve (make sure it is installed correctly)
  • » Make sure tubing is not pinched
Cloudy Water

Unit operation time too short (minimum of 6 hours is recommended)


Water chemistry out of balance

  • » Adjust Alkalinity between 80 -150 PPM
  • » Adjust pH between 7.2 - 7.6
  • » Adjust Calcium Hardness between 100 - 250 PPM (acrylic finishes)

Clean or replace filter

Shock the water with a non-chlorine shock and add a Mineral Purifier Nature 2 (not bromine compatible) or The Frog (bromine compatible).