Hot Tub Supply Spa Depot
 SpaCyclopedia Index Wiring Diagrams About Ozone Plumbing Schematic Buy Ozonators

Install an ozonator for cleaner water with less chemical use. Most of today's hot tubs are ozone-ready, so adding or replacing one is a snap! Some spas take a bit more effort.. we'll show you how. You'll save a bundle when your buy your ozonator from The Spa Depot, where quality comes at a fair price.

Ozonators convert oxygen into ozone. A clear air line from the ozone generator is connected to your spa's plumbing system. The flow created by the pump creates a Venturi suction, which draws the ozone into the spa water where it dissolves.  The ozonator itself is connected to your spa control system, which supplies power and regulates its cycles of operation.

Clarathon ozonator kit
CD Ozonator Kit from AquaSun

Clarathon XL Ozonator
Value Priced Clarathon XL UV Ozonator

Step-by-step instructions are provided with every spa ozonator kit we sell, to make installation easy. Advanced CD ozonators such as Aqua Sun have special technology which greatly increases life expectancy and output compared to older UV designs.

See: Safety Recommendations

Preparing for Ozonator Installation
  • Verify that your spa will accept an ozonator and determine the voltage required.
  • Check electrical system: timer set; system GFCI protected.
  • Check for and correct all leaks in plumbing.
  • Check filters: clean with Eco Soak or Power Soak, or replace spa filter cartridge.
  • For best results, drain water and fill with fresh water. It is easier for the ozonator to maintain purity in a fresh start of clean water. Use Spa System Flush prior to draining.
  • Balance water chemistry, shock, and use a sanitizer system. Ozone reduces the amount of chemicals needed and improves water quality, but will not replace your sanitizer.
  • Verify the plug type you will need and voltage.

Ozonator Components you'll need to Purchase

  • If you are replacing an existing ozonator, or installing in a 100% fully ozone-ready spa, then you will normally only need an ozonator kit. Most of our hot tubs, including Belize Spa models are 100% ozone-ready.
  • Some so-called ozone-ready spas also require the installation of an Venturi Injector.
  • If installing a Venturi Injector, we also highly recommend the addition of our Ozone Turbo Mixer which greatly increases the ability of the ozone gas to dissolve in the spa water.
  • If installing in an older spa which is not ozone-ready, installation may require a bypass injector manifold in addition to the ozonator kit.
  • If you are installing a new ozone system from scratch, you may also need an Ozone Wall Fitting Jet.

We'll explain the different installation schemes below.

Spa Equipment Access

Spa equipment access
Photo courtesy: Belize Spas
Regardless of the type of ozonator installation, the first step (after disconnecting the electrical power) is to remove the spa's access panel.

Identified here in the hot tub's equipment bay:

  1. Equipment control system
  2. Spa's ozone-ready suction connection
    (if so equipped)

Installation in an Ozone-Ready Spa

Ozone-ready spas usually have a small ozone jet near the bottom of the spa. This jet will have a water port, and an air (ozone) port. When no ozonator is present, the jet acts as a water jet only. A clear 1/4" I.D. air suction tube from this jet, with the end capped-off, should be hanging in the equipment bay, if no ozonator has been installed.

Ozone ready connection

Ozone Line Connection

Locate the ozone suction connection as illustrated (2). This is typically 1/4" I.D. x 3/8" O.D. vinyl air tubing. In this case, the tubing has a cap, which is snipped off to accommodate the one-way check valve included in the ozonator kit. This valve helps prevent water from accidentally entering the ozonator.

Attach the ozone check valve to one end of the vinyl tubing supplied with your ozonator kit. The other end of the check valve attaches to the spa's suction tubing ( fig. 2).

The air (ozone) flow direction is away from the ozonator and toward the spa. The valve may be marked as to direction. If not marked, you can determine the flow direction by blowing into one end of the valve. Installing the check valve backward will prevent functionality, so this is important.

ozonator check valve
  Attach the other end of the air tubing to the ozonator's barbed fitting as shown in the photo. ozonator air line connection

Next: Electrical Connection

Installation in Non Ozone-Ready Spas (several options)

Jet Water Line Connection Method

A simple way to hook up the line is to use an ozone injector, which is a Venturi placed into a jet water line, typically 3/4" I.D. tubing. The water flow provides suction which draws ozone into the spa.

Spa Ozone System

This method is very effective for ozone dispersion. Select a jet as near the bottom of the spa as possible, for maximum water contact. Make sure to observe the flow orientation, as noted on the injector. The ozone line should be double-looped above the water line (called a Hartford loop) and the supplied air check valve installed to help prevent water intrusion into the ozonator.

Ozone Turbo Mixer
Turbo Mixer

Tip: Dissolving Ozone More Effectively

You can achieve optimum ozone effectiveness by adding our Ozone Turbo Mixer which increases the amount of ozone which dissolves in the water by up to 45%. This greatly compensates for a lack of contact time of the gas to water, especially in tubing runs from the Injector to the ozone wall jet which are not long enough to fully dissolve the ozone gas prior to introduction into the spa vessel. Note: Turbo MIxer is not needed for XL-80 model (below).

Our new AquaSun XL-80 Ozone System is even simpler to install. It is the only ozonator with a built-in Venturi injector and a built-in cavity mixer. The unit even has an internal check valve. Since there's no air line to hook up, installation could not be easier. The XL-80 even auto-detects and adapts to either 120V or 240V power!

XL-80 Spa Ozone System

Next: Electrical Connection

Main Water Line Connection Method

If jet water line access is impractical because your spa is full-foamed or lines are inaccessible, another excellent method is to install an ozone injector manifold into the main water line. This line is the hot tub's large plumbing, typically 1-1/2" or 2" I.D. flex pipe. The manifold employs a bypass valve design to prevent drastic reduction of jet pressure and strain on the pump that would result by placing an injector directly into this line. This is also the preferred system for installing an ozonator on an in-ground spa.

ozone injector manifold system
(location of filter may vary)

bypass ozone injector
Injector Manifold

Since ozonators power-on with the low speed pump, the Injector Manifold has a special valve which opens during high speed circulation, allowing the larger volume of water to bypass.

The injector creates a suction which pulls ozone from the ozonator, mixes it with water, and delivers it to the spa jets very efficiently. It is important to install the ozone Injector Manifold after the hot tub heater, pump and filter, to avoid possible damage to those components which could be caused by a high direct concentration of un-dissolved ozone.

After installation of the Injector Manifold, the ozonator output line is connected to the injector suction bib fitting, as shown above. To prevent water from backing-up into the ozonator, a check valve should be installed. The ozonator output line should also be looped high in the spa cabinet (above water level). This is called a Hartford Loop, and provides additional protection from water back flow.

Next: Electrical Connection

Jet Connection Method

Connecting ozone line to a spa jet You can connect your ozonator's air (ozone) line directly to one of your hot tub jet's air orifices, if you can access it. Select a jet that is low in the water for maximum ozone dispersion.

Some hot tub jets are fed by a manifold with separate air lines to each jet, while other designs use looped jetting with air going into one side of a jet and out to the next jet, and so on, with each jet having two air connections.

  • If the jet is fed by a manifold, cut the air line off a few inches from the jet, then cut this same line off short at the manifold and plug the tubing end at this manifold.
  • Connect the ozone line to the jet, as illustrated above.
  • If your spa has looped air lines to the jets, you will need to bypass one of the jets.  Simply cut the jet's air lines out of the loop, then reconnect the loop with a length of flexible hose, securing with two hose couplers.
  • Since looped jets have two hose connections, plug one of them with a short piece of hose and a cap, and connect the ozonator line to the one remaining.
  • Route the hose so that at some point it passes above the water level of the spa (a Hartford loop). You may need to tie the hose up to keep it in place. This will help insure that no water can inadvertently enter the ozonator unit.
  • In either case, install the check valve supplied with your ozonator kit.

Next: Electrical Connection

Air Induction System Connection Method

Air induction installation This is an alternate method for installing an ozonator into a spa's air induction control system. Although this method will work, it is not nearly as reliable in dissolving ozone into the water as the previous methods listed.

If your spa has topside air controls, you have an air induction system. If you can access these parts, you can use this method for installing the ozonator's air (ozone) line.

  • If your spa has more than one air control line, select the one with the best suction, connected to the lowest spa jet possible.
  • Cut the air control tubing, and install a tee with a barbed hose connector for the ozone line, as shown in the above illustration.
  • Attach a 6" length of ozone air line to the tee's hose connector for intake.
  • Attach the other end of the 6" air line to the check valve, with flow towards the tee. You can determine the flow direction of the check valve by blowing into it, if it is not marked.
  • Attach the remaining ozone tubing to the check valve and to the barb fitting on the ozone generator, and secure with supplied clamps.
  • Route the hose so that at some point it passes above the water level of the spa (a Hartford loop). You may need to tie the hose up to keep it in place. This will help insure that no water can inadvertently enter the ozonator unit.

Note: When the spa's air control valve is in the open position (no air to jets) little suction will be produced, and therefore little ozone induced into your spa water. The air valves must be in sound condition, allowing all air induction to the hot tub to be shut off or on, in order for this method to work reliably.

Next: Electrical Connection

Electrical Connection

Most of today's spa packs or control systems, located in the spa's equipment cabinet, will have an ozone receptacle to supply power to the ozonator, and control its cycle.

There are many plug types used for various hot tub makes, the 4-prong Amp style being the most common.

See: Safety Recommendations

IMPORTANT: Make sure the voltage is the same as prescribed on the label of the ozone generator. Over-voltage or under voltage will void customer warranty. If in doubt, refer to your spa's manual or check with a voltage tester (available at any home center). If your spa pack does not have an outlet for connecting the ozonator, the electrical cord should be wired to the pump controller by a qualified electrician so that the ozonator comes on only when the pump is on. (For 2-speed pumps, ozonators should be wired to the low-speed pump circuit).
Balboa controller with amp plug Amp Plug - Internal Connection
Pictured (fig.1) is a Balboa control system, such as used in most Belize spa models. After removing the access cover, the ozonator's electrical connector simply plugs inside. This model uses an amp style ozonator plug. Refer to your spa control's manual for location of ozone receptacle and plug type.
  J&J Mini Plug - External Connection
Pictured here is one of our Easy Pak spa controls, featuring external J&J Mini style receptacles for ozonators and other equipment components.
EasyPak spa pack with J&J Mini plug

Mounting Instructions

Fasten it with screws Your ozonator may be mounted with screws almost anywhere in the equipment bay that space permits, preferably to a wood support. Mount the unit as high as possible.


Safety Precautions & Recommendations:
  • Turn off hot tub power at source breaker before installing or servicing ozonators. Disconnect the spa's power cable as an additional secondary precaution.
  • All applicable electrical codes must be followed during and after installation. All connections to be made by a qualified electrician. Electrical installations carry the risk of electric shock.
  • Connect only to a properly grounded, GFCI-protected power source. Do not bury cord.
  • The ozone generator is to be located with a looped supply hose (Hartford loop) above the water level. Make sure the check valve is properly installed, and oriented in the correct direction.
  • Make sure the ozonator voltage specification of your ozonator matches the voltage of your equipment system's ozonator circuit. Most systems use 120V, but many operate at 240V.


spa customers write  Consumer Reviews
Aqua Sun Ozonator Kit
"I looked at the Del Eclipse CD and the Prozone UV ozonators. Decided on the Aqua Sun because they last so much longer. It was extremely easy-- installed myself for a fraction of the cost that the spa store here wanted to do the job ($250). Your technical guy was real helpful to me over the phone too. Just wanted to thank you for the quick shipment and the great help. This is the second time I have bought from The Spa Depot, and I will no doubt be back again for my chemicals and filters since your prices on those are about half the local cost."

Ron Westfall
Great Neck, NY


Spa Depot, The, Spas & Hot Tubs - Dealers, Olympia, WA

BizRate Customer Certified (GOLD) Site - The Spa Depot Reviews at Bizrate
BizRate Circle of 
Excellence Site – The Spa Depot Reviews at Bizrate