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Aerobic Treatment Unit (ATU) and Aerator Maintenance

  • Usually through the means of a mechanical agitator or air pump, an Aerobic Treatment Unit (ATU) uses the addition of oxygen to better treat the sewage and create cleaner effluent discharge to the final treatment area of your system.

    • Mechanical aerators are usually a motor connected a shaft that turns submerged agitators to introduce oxygen into the effluent. These will need to be periodically removed so they can be inspected and properly cleaned.

    • The other type is a pump system (varying types of pumps) that pumps air into some type of distribution system, usually diffusers, located inside the aerobic treatment compartment. These systems commonly have filters that need to be cleaned and the air delivery system is subject to plugging if the unit is not properly maintained and cleaned on a regular basis.

  • There are a vast number of aerobic tank designs, but they all generally are composed of three main parts.

    • The septic or trash tank

    • Followed by the aeration chamber

    • And finished up with a clarification chamber.

    • Sometimes there are additional chambers depending on the design to hold pumps or disinfection components.

  • These systems often require a monitoring and maintenance contract with a registered service provider.

  • All the tank’s compartments will need to be pumped and cleaned periodically in order to insure proper operation

    • Typically, this will fall between every 24-36 months for most users.

    • This time can fluctuate depending on usage.


  • Due to the vast number of aerobic designs, the original design and permit paper work is needed in order to establish the proper monitoring, maintenance and cleaning for the system.

  • After determining the type of system, a customized service plan will be generated to ensure that your system is thoroughly examined.

  • Copies of the reports will be provided at the completion of the service.


  • Aerator Cleaning

  • Aerobic treatment unit (ATU) Pumping and Cleaning (All Chambers)

  • Aerator replacement and repair

  • Aerator installation

  • Controls – Monitoring and Alarm replacement and repair

  • Controls – Monitoring and Alarm installation

  • Service and Maintenance contracts for permitting requirements

  • Service and Maintenance contracts for frequent cleaning and up keep

  • Replacement of damaged components

  • Installation of risers and lids

  • Installation of inspection and maintenance ports

  • Locating and Accessing Services

  • System inspections


  • Ground level access to tank and distribution components

    • Locating and access services available

    • Installation of Riser and Lids available

    • Installation of inspection and maintenance ports

  • Tank located within 200 feet of gravel or paved path

    • Additional distances available upon request

  • 12 feet of height clearance from road to location of system

    • Accommodations can be made upon request

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