The ASD PCK 1.5 – 8 biological wastewater treatment plant differs from the standard treatment plant ASD PCK 1.5 – 8 in that it is shortened by 30 cm. As a result, the treatment plant can be buried in high groundwater, as well as where the outgoing pipe leaves the house. All owners of private houses with a larger number of residents, up to 10 inhabitants, with a larger square footage of the house, 120 m2 and more, choose a relatively shallow biological treatment, where there is a greater load on the sewage system. communications, for example several toilets, independently use a washing machine, etc. Also, these devices are already suitable for small businesses, offices, small cafes, guest houses, offices, as well as DUS (Fuel filling stations)