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ADVANTEX° O&M MANUAL Low Filtrate Mate Levels - Residential Adequate Time and Temperature — packed bed filters normally yield 98+percent Nitrifying bacteria require one to two months to nitrification(ammonia to nitrate).Therefore the develop,and extremely cold temperatures(below ammonia levels in the filtrate should be low and 400 F) retard that process.If the AdvanTexm the nitrate levels higher.Some denitrication typi- Treatment System has been installed in a very cally is experienced through the packed bed filte, cold climate,nitrification may not"kick in for So the normal nitrate level may vary. Be sure you several months until warmer temperatures are are familiar with the mode of operation,as some reached.Typically,a June-September installation AdvanTexm modes are configured to produce lower nitrate levels. If it appears that nitrification Provides the necessary temperatures fora 30-60 is dropping off- day nitrification start-up time.Ona nirrifiers colonize,they typically continue to nitrify • Check the recirc ratio;adjust as necessary* through normal winter conditions.Only in (high recirc ratios may drive pH too low for severely cold regions should additional insulation effective nitrification/denitrification and low be necessary recirc ratios may not provide sufficient aeration) • Verify incoming ammonia levels • Check recirc/blend for sufficient organic food source(high BOD—see Table,page 7—: may cause greater oxygen demand through the filter,reducing nitrification) *Keep in mind that a retire ratio thad too high can generate a highly aerobic biomat growth on the pump filer,•and a retire ratio thatc too low can tend to lfberate periodic odors during dosing events So march for the optimum ratio (typicaddy between 2 and 4.•1)