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6 cells also provide a food source for the incoming bacteria. Upon completion of the sludge return, the MLT pump can again fill the clarifier. As the supernatant is transferred to the chlorine contact chamber, a liquid chlorine solution is used to disinfect the supernatant. AquaClear does not recommend the use of chlorine tablets, as they are generally unreliable due to decomposition in high-humidity environments which leads to failure of the tablet feed system; also, hypochlorous acid (HOCL) is a much better disinfecting agent than the hypochlorite ion (OCL) . After 1 hour of chlorine contact time, the clarified and disinfected effluent is pumped from the chlorine contact chamber, first through the pressure filters then through the ozone mixer, which is inline and fed by the ozone generator, then through the ozone contact tower, which extends the ozone contact time, and out to the pond. A small amount of liquid remains in the chlorine contact chamber after discharge and is returned to the aeration chamber for reprocessing. The contact time and dilution factor render the chlorine in this small amount harmless to the on going biologic activity in the aeration chamber. The ozone inject during transfer from the chlorine contact chamber provides conversion of chlorine residual in the final output to .a chlorate which is taken up by plant life, thus making the receiving body of water, safe for fish and fowl . With the ozone generator installed, chlorine residual testing is accomplished at a tap in the output of the chlorine contact chamber; the presence of approximately 0 . 5 mg/L of chlorine at that point provides assurance that there has been adequate chlorine contact time. The conversion of chlorine residual by ozone also ensure, that, in the case of irrigation, there will be no conversion of soil minerals to salts and thus no forced buildup of salt-toxicity within the soil . NOTE: The ozone generator is sized at twice the grams/hour requited for potable water treatment and will negate the need for any chlorination at all should the County Health Department not mandate its use. Many states (most notably New York) are banning the use of chlorine for any form of water/wastewater disinfection and are relying on ozone and ultraviolet completely. The chemical disinfectant potential (V) of ozone is 2. 07 as opposed to 1. 36 for chlorine as HCLO or . 025 as an ion. Ozone causes immediate destruction of bacteria and viruses as opposed to merely altering the DNA to prevent replication, as is the case with ultraviolet. Should chlorine not be mandated for- this project, then the chlorine contact chamber will either be eliminated from the system or will be used as an additional clarifier