Knowledge and guides

Yes. Wash water from a car wash must be treated before discharge, and in practice a class I coalescing separator is required under local discharge regulations and the municipality's discharge permit.

Class I has a coalescing filter and reaches below 5 mg/l residual oil. Class II is gravimetric and reaches below 100 mg/l. Car washes and installations with emulsified oil normally require class I.

A soakaway infiltrates the stormwater into the ground. An attenuation tank holds the water back and releases it in a controlled way to the sewer network via a flow regulator. A soakaway is used where the ground can infiltrate; an attenuation tank where it cannot.

A flow regulator (vortex regulator) sits on the outlet of an attenuation tank and limits how many litres per second are released onward, so that the discharge stays within the municipality's requirements.

Polyethylene (PE) is corrosion-free and requires no sacrificial anodes the way steel does, and it is lighter and more leak-tight than concrete. This gives a long service life in the ground.

Yes. A sand trap removes sand and particles by sedimentation before the water reaches the separator or soakaway, so the coalescing filter and voids do not clog up. This keeps performance up and extends service life.

When the property lacks public wastewater connection and lies in an area where infiltration or discharge is not permitted, for example near drinking water sources. Sealed tanks are common for cabins and holiday homes, and are emptied with a vacuum tanker.

No. A sludge separator for plumbing removes sludge in indoor heating and cooling systems. A particle separator treats outdoor stormwater, that is rainwater from roads and impermeable surfaces, before it is infiltrated or discharged.