Questions and Answers - Wastewater treatment

The existing concrete pit must be emptied and thoroughly cleaned. The tank must be checked to make sure it is still fully sealed. Not only the entire tank but also the dividing walls between the individual chambers must be watertight. An empty pipe should be laid to the planned site of the control unit or external control cabinet. When fitting a new tank downstream, the supply and discharge levels should be noted.

For the Klaro Easy, in this case we recommend our ZK Plus controller. The system only works optimally when there is an incoming flow of wastewater. When the infeed is very low or the residents are absent for some time, water is moved around the system. This automatically activates and keeps alive the bacteria necessary for the cleaning process.

The option of switching GRAF small wastewater treatment systems to an energy-saving holiday mode makes it possible to save money at the appropriate times. With the ZK controller the holiday mode is set manually; with the ZKplus it happens automatically.

If possible, fully biologically cleaned wastewater should be discharged into a flowing watercourse such as a ditch or stream. If there isn’t a watercourse available, then the ‘clear water’ must be infiltrated into the ground. The soil needs to be of a suitable permeability with sufficient distance from groundwater and in compliance with the local authority’s requirements. 

Smell is not normally a problem with small wastewater treatment systems as long as they are properly ventilated. However, it is advisable to maintain an adequate distance from living areas and terraces and to ensure good ventilation of the system.