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Design Ideas For Improved Ozone Applications.


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Degasser columns can be expensive and unreliable. Here is an idea to make a naturally vented contact tank:

Example:

60-gpm system with ozonator and salt chlorinator.

01) Get 15 feet of 6-inch diameter PVC pipe to use as a contact tank.

02) Cap the top and bottom of the pipe.

03) Put a 6-inch "T" at 18 inches, 2.5 feet and 11 feet.

03) Stand the PVC upright.

04) Fill the contact tank with the clean water that is coming out of the filter.

05) Introduce the fill at 11 feet and allow the tank to fill to 12 feet above the level of the surface of water in the pool.

06) Remove the returning water at about 18 inches by gravity feed alone. The 12 feet of water column will provide the necessary pressure (about 5.2 psi). Adjust pressure with a restrictor to achieve 12 feet of head.

07) Introduce the ozone at about 2.5-feet using an injector or diffuser. This will be above the return, so no ozone will get in the return line. The ozone will bubble through about 10 feet of water (15 gallons) before going out the open top of the 6-inch PVC pipe. You can put a vented cap to prevent debris from falling in the tank.

08) Run the water through a 175 square foot cartridge filter (optional) before sending it through the salt cell and back to the pool.

One issue will be if the pressure increases by more than about 1 psi, the PVC tank will overflow. Therefore, you would need to be sure that the pressure would not rise more than 1 psi over the time that the system would be unattended. Because the water is already filtered, this should not be a problem.

You could cap the top of the tank and run a small (3/4-inch) tube from the top of the tank to the pool to allow any unexpected overflow to go back to the pool. The ozone gas would just go through the tube and out to the atmosphere.

15 gallons of water weighs about 125 pounds, so the tank would need to be properly supported. The 15 feet of 6-inch pipe would be awkward in many situations. Perhaps it could be mounted against a two-story house without too much problem.

You could use a clear tube to monitor the water level in the PVC pipe.

It would be even better if there were a separate return that could be used for just the ozone. If there were a separate return available, I would send about 40 to 50 gpm to the salt cell return and 10 to 20 gpm to the ozone contact tank.

Most of the bubbles that you see are plain air. There is only a tiny amount of actual ozone in the bubbles. The bubbles will aerate the water, which will cause carbon dioxide to be lost, which will cause some pH rise.

Does anyone have an opinion about any of this? Any ideas about other ways to improve the use of ozone? Any problems with the basic design idea?

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