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inspecting all components and cleaning and repairing the system when needed. A visual inspection of the effluent is required <br />and often a lab analysis is necessary. <br />If problems arise with the supply of air to the bacteria, the tank loses all effectiveness. If there are problems with settling, <br />which are more likely in these designs than in conventional tanks, there will be problems in the soil treatment system. These <br />tanks must be monitored frequently and repaired as needed. <br />The costs to operate an ATU are based on the run-time of the compressor, and average less than ten dollars per month for an <br />individual home. Overall operational costs of $200—$500 per year include pumping, repairs, maintenance, and electricity. Some <br />homeowners notice the constant hum of the blower. <br />Summary <br />With proper design and a good maintenance program, the aerobic system should perform well and treat wastewater for a long <br />time. ATUs have a small land requirement, but are highly mechanical and require more management than most onsite systems. <br />City of Ramsey Note <br />Based on a very cursory review, the cost of an aerobic system could range from $1,000 to $5,000 more per system compared <br />to a traditional anaerobic system. <br />