Elements and Compounds

How do ozonators compare to chlorine and salt?

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2015-07-15 20:44:47
2015-07-15 20:44:47

I own and operate a small pool construction/service business, in my experience corona discharge ozone units sized properly are a wonderful addition to chlorine treatment. they do NOT replace chlorine but do reduce the amount needed to maintain 1.5 ppm and help maintain a much nicer cleaner looking and smelling pool. ozone is an extremely strong oxidizer and burns away many impurities instantly but provides no residual affect or treatment for "dead-spots" uv ozone generators in my opinion produce to little ozone to be effective and most that I have tried burn out in no time.

PS i have no experince with salt generators I have read alot about them but have not seen any in my area yet

2nd

I will start by saying that I DO work for an Ozone Generator Manufacturer. I partially agree with the above answer as far as Ozone not being a "stand alone" system. Ozone has a very short half life so when the pool pump shuts off the Ozone production is stopped as well. You still need to maintain 0.5 to 1ppm of Chlorine or Bromine residual to act as a "buffer" and sanitizer.

The part of the above answer that I DON'T agree with is the Corona Discharge (CD) statement. There are 2 different ways to produce Ozone on site at a residential pool/spa application as follows:

1. Corona Discharge (CD) - Ozone is created by creating an electrical arc over a tiny gap on a metal "chip" inside the unit. This initially creates a large amount of Ozone, but the "chip" is very short lived. The problem with this method is that unless an air dryer or prepared oxygen (tank) are used, Nitric acid will quickly build up on the chip, eliminating Ozone production within months.

2. UltraViolet (UV) - With this method, Ozone is created by passing ambient (outside) air across 1 or more specific wavelength UltraViolet lamps. The amount of Ozone produced with this method is less than that of the CD method, but still more than enough for the intended applications (pool and spa water). The UltraViolet method will produce sufficient Ozone for roughly 10,000 hours before a lamp change is needed.

The other important factor when looking at an Ozone system is the installation method. These systems can either be installed on the suction or pressure side of the pool pump (depending on manufacturer) which will make a large difference in the effectiveness and benefits of the unit. If the unit is installed on the suction side of the pump the Ozone is injected into the highest pressure point of the system which is between the pump and filter. This forces the Ozone mixture into the water and uses the filter as a reaction chamber, giving the Ozone adequate time to oxidize the non-living bather wastes in the water. As a "side benefit" this installation also extends the time between filter cleaning as the Ozone degreases the filter as well. If the Ozone is installed on the pressure side of the pump, it doesn't have enough time or pressure to effectively oxidize the water, it mostly just runs along the top of the return line and off-gases when it gets to the pool returns.

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