It utilizes the combustion of a combustible gas (a mixture of hydrogen or acetylene and air) to heat the coil in order to heat the compressed air fed to the coil to the desired temperature. The amount of air fed into or out of the coil is regulated by a plug.

These mixers are mainly divided into mixing submersible mixers and low-speed submersible propeller mixers. They are used to promote and mix sewage, slurry, industrial liquids containing suspended solids in sewage treatment, especially municipal and industrial sewage treatment projects.

A septic tank is an underground waterproof container, often made of concrete or PVC materials. Its internal space allows the solids in the wastewater to settle and be partially decomposed by bacteria, thus completing the primary wastewater treatment. And the effluent generated afterward will be discharged into the drainage field for further treatment.

The observation well is usually constructed by means of vertical drilling, with sensors or sampling devices inside. This component does not directly participate in the water treatment process, and is only used for data collection (such as water level, water quality, temperature, etc.).