What Should I Do With My Excess Ozone?

If you have ever been in a pump room when ozone is being made and it is not properly ventilated, you know the smell can sometimes be quite overwhelming. This can easily be avoided if you apply safe ventilation techniques.

There are several types of ozone destruction systems available, such as using ultraviolet light irradiation to decompose ozone as it passes, heating ozone to extreme temperatures (at or above 428 °F [220°C]) for several seconds, or sending the ozone through a catalytic destruct system. We will look at the most popular methods.

Three popular options for controlling off-gas

  • Running a line to off-gas outside
  • An ozone catalytic destruct system
  • Activated carbon destruction method

The “run-a-line” Method

Ozone Catalytic Destruct System with water trap

Ozone Catalytic Destruct System

The cheapest and easiest method is to simply run a length of ozone resistant (typically Teflon®) tubing from a off-gas vent to a elevated location outside of the building. With the half-life of ozone being so short, the excess ozone will quickly revert back to oxygen and be vented to ambient air.  If this is not an option, for example, you are in a basement that has no windows and you can’t easily run tubing under a door outside, then the next option would be a better solution.

If using this method, there are some important points to remember.

  • Make sure your line is free of debris or obstructions. Any blockages will result in back pressuring your tank and therefore causing loss of vacuum at the injector.
  • If you are operating your equipment in freezing conditions, it is advisable to move your tubing to a location that is not affected by the extreme temperature. As with most auto off-gas systems, there will be condensation build up in the lines. If that water freezes, blockages may occur.

Ozone Catalytic Destruct System

The most common method is the catalytic destruct system, which uses Carulite®, a combination of Manganese Oxide and Copper Oxide. These types of destruct systems might also contain some type of heating element to burn off the ozone as it passes to be extra sure of ozone decomposition as well as an additional “water trap” (pictured) to help capture moisture before it can reach the dry media of the destruct.

Activated Carbon Method

Activated Carbon is also an excellent way to eliminate excess ozone. The most important point to remember when it comes to using activated carbon to destroy ozone is to always use a metal container (preferably stainless steel) to hold your carbon media. The reason for this is because the process of passing ozone gas through carbon causes the carbon to heat up and reach extreme temperatures. If you use a plastic container to house your media, you greatly increase your risk of it melting and causing an ozone leak, or worse yet, starting a fire. So, when using activated carbon, keep in mind, use a metal container.

-Authored by Brandon Turney, Service Technician, ClearWater Tech, LLC


What Materials are Compatible with Ozone?

Since ozone is the strongest oxidizing agent currently available for the treatment of potable water, extreme caution should be taken when considering what materials should be used in conjunction with your ozone system installation. Everything that comes in contact with ozone, such as piping, valves, gaskets or pumps, should all be carefully selected based on durability, reliability, and more importantly, resistance to ozone.

Most natural and synthetic rubbers and many plastics cannot be used as seals, gaskets or o-rings because they may become brittle and crack.

Below is a list of materials* that are compatible with the use of ozone:





304L Stainless Steel ABS Plastic Acetal (Delrin®) Buna-N (Nitrile)
316L Stainless Steel Aluminum Cast Iron Magnesium
Butyl Brass Hytrel® Natural Rubber
Ceramic Bronze Monel NORYL®
Chem-Rez Copper Neoprene Nylon
CPVC LDPE Polypropylene PPS (Ryton®)
Durachlor-51 Polyacrylate Polypropylene Polyamide (PA)
Durlon 9000 Polyethylene Steel (Mild, HSLA)
ECTFE (Halar®) Polysulfide Zinc
EPDM (up to 100° F) PVC
EPR Teflon® Tape
ETFE (Teflon®) Tygon®
Ethylene-Propylene Vacum
Flexelene® Viton®
Kalrez® (up to 100° F)
Kel-F 2800 (PCTFE)
PTFE (Teflon®)
PVDF (Kynar®)
*Ozone Solutions. "Material Compatibility of Ozone".  N.D.

Bookmark and Share