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Vision in the field

With no access to the sewage system, we have to think about how to handle the sewage. Where to start, what technology to choose, where to place the tank, what to do with treated sewage and ... how much it will all cost.

The first step is to establish the location of the sewage treatment plant tank and the location of the treated sewage receiver. The receiver may be a water flow, however, for formal reasons, it is usually the ground. Depending on the amount of sewage, soil type and groundwater level, the Installer will select an infiltration system.

The optimal location of the sewage treatment plant allows the gravitational (without pumps) flow of wastewater through the treatment system. This is especially important in the event of power cuts. Also, the sewage treatment plant tank should not be located on sites with is a risk of flooding with surface water, e.g., in depressions. Proper operation also requires the disposal of solid sludge by a slurry tanker – usually a volume up to 2m³ once every 12 months; please keep this in mind when planning the location.

Unfortunately, not all questions can be answered without visiting the plot, exploring the ground conditions and performing basic measurements, so we encourage you to contact us for an initial calculation and a possible appointment in the field.


The costs of a complete domestic sewage treatment plant with an infiltration system, connection, preparation of documentation, i.e., "readymade", may differ significantly depending on the number of people in the household, soil and water conditions, distance, pipe cavity and the technology adopted.

Lower costs are favored by well-drained soil, low groundwater level, small recess for connection and short distances between the building, the treatment plant and the sewage receiver. In such conditions, the cost of the complete system equals several thousand zlotys. A large number of people in the household, poorly permeable land, high water level often increase costs to more than PLN 20,000.

The technology should be selected depending on the characteristics of the facility, unevenness of flowing sewage, device location, and individual expectations of the Investor.

Before proceeding to the next step, a decision should be made regarding the choice of a specific model of wastewater treatment plant.


Before we decide to commence work, an application should be submitted to the Commune Office and the Water and Sewerage Company in order to obtain a certificate confirming the inability to connect the property/plot to the sewage system. This should be followed by a notification to the competent environmental protection authority. The notification must be made at least 30 days before the planned use of the treatment plant. The application may be accepted by the commune head, mayor or city president. The notification should be accompanied by: a situational and altitude map with the marked location of the treatment plant and the method of discharging treated sewage, construction notification form, declaration of the plot ownership and technical documentation of the sewage treatment plant.

Recently, we have come across different interpretations of the regulations on domestic sewage treatment plants, so we encourage you to contact us to conduct a conversation with your local installer.


Please keep in mind that the quality and durability of the treatment system are influenced by both the chosen technology and proper selection of the wastewater receiver, as well as correct installation. Installers should take into account the depression of the sewer pipe exiting the building, the slope of the terrain, distances and the depression of the raw sewage supply pipe to the sewage treatment plant tank. Considering the soil and water conditions, a decision should be made as to the type of installation. The tank should be protected against subsidence, ground forces, and water buoyancy. During installation, the sewage treatment plant is flooded with water, therefore it is necessary to provide water supply.

Bio-Set biological wastewater treatment plants have the option of discharging the treated wastewater by gravity or under pressure. Whenever possible, we recommend making a gravity drain. This is especially important in the event of interruptions in electricity supply, but it also cuts down operating costs. The treated sewage can be discharged to water courses or to the ground. When discharging sewage into the ground, it is crucial to match the infiltration area to the amount of sewage and soil permeability. WellSET absorption chambers are perfect in the case of well-drained soils, while poorly permeable soils and the need to increase the infiltration area, we recommend the DrainSET drainage system.

Completion of the plumbing, construction and electrical works is followed by the launch of the device and the delivery of sewage. In the case of RotoSET and EasySET technologies, the user does not inoculate the bed or add bacteria and biopreparations. The bacteria multiplication process is automatic and the device will reach full cleaning efficiency after a few weeks.

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