If the value of Ammonia is ...

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If the value of Ammonia is less than 3 mg/L, you may consider using Zeolites as filter media for final effluent. Furthermore the zeolite sand can be regenerate simply by drying the media under the sun (although the efficiency of absorption will reduce most probably around 60=70%. If using Chlorine for oxidation, might result in THM production. Chlorine oxidation ratio to Ammonia, based on my experience is 5:1 (5 mg/L free chlorine to 1 mg/L of NH4).