Ozone Fish/Aquarium


The use of ozone has long been a standard practice in industrial and public water purification plants, and large scale

 public aquarium/fish pond filtration, as one of the best and most efficient means to increase water quality, while 

still being able to promote water conservation.

How do I get ozone, and how do I use it in my aquarium/fish pond?

Ozone needs to be generated as needed with a device called an ozonizer or ozone generator.  Most modern units

 available for the aquarium hobby use a Corona Discharge method to create ozone. In a Corona Discharge unit, air

 is passed through a strong electrical field which causes atmospheric oxygen (O2) to break apart into single oxygen

 molecules.  Some of these oxygen molecules will then combine back together after passing through the electrical 

field to form Ozone (O3).  Ozone needs to have contact time with the water so that it is exposed to the material

s that you wish to oxidize.  Fractionating the ozone gas by drawing it into the air intake of your protein skimmer, 

you can use your skimmer as a highly efficient contact chamber.  This works for both venturi type, and air pump 

driven protein skimmers. 


How much ozone needs to be used, and is it safe for aquarium /fish?

The best way to monitor and control ozone is with the use of an ORP monitor or controller.  ORP stands for Oxidation 

Reduction Potential, and In terms of your aquarium/fish water, it reads an electrical voltage in Milli Volts (mV) which 

measures the oxidation ability of the water.  As Ozone is applied the ORP level increases.  Natural sea water has an 

ORP value of 350-400 mV.  ORP levels of 200 or less in your aquarium/fish pond are indicative of low oxygen, high 

dissolved organic, conditions.  By monitoring the ORP level in your aquarium/fish pond, and maintaining it between 

250-350mV, you can adjust your ozone dosage accordingly. Using an ORP controller simplifies this process to shut off 

you ozone generated at a desired ORP level.  You should never exceed an ORP of 400mV in your aquarium/fish pond.