Chriwa Group - Water matters. We care.


The wide range of Chriwa water treatment technologies allows the individual and reliable treatment of different raw water qualities into product waters optimally adapted to the respective process. Intelligent processes for water recovery and sophisticated visualisation and operational data acquisition systems offer all the possibilities of modern and economical water management from a single source. The know-how covers all known treatment processes:

Adsorption / Desorption

Adsorption is the accumulation of a substance on the surface of an adsorbent. The reverse of adsorption, i.e. the detachment of a substance from the surface of the adsorbent, is called desorption.

Ammonium removal

Ammonium is generally not harmful to human health. The limit value according to the Drinking Water Ordinance (TrinkwV) is 0.5 mg/l.

Chlorine electrolysis

Chlorine electrolysis systems from the Chriwa Group produce a fresh disinfection solution in the form of THM-free sodium hypochlorite or hypochlorous acid directly on site from the simple basic elements of salt, water and electricity.


Destruction or inactivation of all pathogenic germs.

Deferrisation / Demanganisation

The removal of iron or manganese from the water. Can be achieved by aeration or by overflowing over coke and filtration over gravel or anthracite coal.

Removal of arsenic, fluoride, radon, radium and uranium

Chriwa Wasseraufbereitungstechnik GmbH offers a wide range of different process solutions to remove these substances. For this purpose, special and highly optimised inert absorption materials and filtration media are used, which are also approved for drinking water and ensure the highest treatment quality.

Degassing / gas stripping

Unwanted foreign gases such as CO2 , methane or hydrogen sulphide in the water lead to disturbance of the biology in the filter tanks, to a reduction in the deferrisation and demanganisation performance and to taste and odour problems in the foreign water.

Softening and decarbonisation

Softening refers to the removal of hardness-forming calcium and magnesium salts from water by the addition of soda or sodium phosphate or by ion exchangers.


All naturally occurring water contains free CO2. Free excess CO2 has an aggressive effect on metal and even concrete.

Decontamination / Detoxification

Chriwa Wasseraufbereitungstechnik GmbH offers a wide range of different process solutions for the decontamination and detoxification of water. For this purpose, special and highly optimised physical and chemical processes are used, which guarantee the highest treatment quality.


Finely suspended substances and colloidally dissolved impurities can be removed from the water with the help of flocculation. After intensive analysis of your raw water parameters, we determine the flocculation additives required for your process.

Ion exchange

Ion exchange is a process in which water flows through a container filled with exchange resins.

Membrane filtration

Membrane filtration is a physical separation process in which water flows through a semi-permeable membrane due to a pressure difference and is thus purified of dissolved substances.


Our team offers comprehensive process solutions for the neutralisation of alkaline as well as acidic fluids.


All common processes can be used for the oxidation of your raw water. These include, in particular, physical and chemical processes such as aeration with atmospheric oxygen, UV irradiation and the use of strong oxidants such as potassium permanganate, chlorine, ozone and hydrogen peroxide.


Sedimentation is the gravity-dependent deposition of solids in the bottom area of containers.