Combined sewer overflow systems with solids retention

Our promise: a solid sewer upgrade for solids-free wastewater

Amiblu CSO Chamber and Amiscreen

When rain, stormwater runoffs and municipal wastewater flow together in a combined sewer channel, strong precipitations can lead to critical situations: Wastewater treatment plants are overloaded and large amounts of polluted water run into ecologically sensitive lakes and rivers. Overflow structures offer a solution for this problem. With the Combined Sewer Overflow (CSO) chamber and the Amiscreen, Amiblu provides two particularly reliable and efficient options.

The Amiblu Combined Sewer Overflow systems separate suspended solids from the wastewater very efficiently and direct them to the wastewater treatment plant, while the cleaned part of the water is led into the receiving water course.

Hobas CSO Chamber in Ticino, Switzerland

Your benefits:

• reliable stormwater overflow
• low-maintenance, self-cleaning system
• optimum separation of suspended solids (design enhances secondary flow effects)
• additional storage function
• modular system
• completely corrosion resistant
• quick installation
• little space and excavation required during installation


Technical data

Diameter, pressure, stiffness, and so much more… All the technical hard facts you need to plan, lay, and operate our pipelines.


Reference database

Over 30,000 projects in over 125 countries in over 60 years: Discover spectacular and technically challenging construction works with Amiblu’s technologies (Flowtite, Hobas, Amiblu, Amiscreen) in our reference database.


Our footprint

We aim to have life cycle assessments for all products by end of 2022 and a carbon-neutral pipe production by 2030. We use the resources we have—our business, our voice, and our network—to fight the climate crisis and inspire people around the globe to value water as we should.