In general, water treatment measures should be adapted to the type of corrosion that is to be expected or has already occurred, the installation and operating conditions and the material properties. BWT expert advice based on a water analysis is recommended.

Product properties
BWT Mineral F4 is intended for the treatment of drinking and process water, hardness range hard, up to max. 65 °C water temperature. Typically for waters from 21 °d total hardness or total alkaline earths 2.5-3.8 mol/m³ and maximum 14-18 °d carbonate hardness. Water with low total hardness but with 14-18 °d carbonate hardness is also optimally treated with BWT Mineral F4.
The products correspond in their composition and purity:
  • the list of treatment substances and disinfection processes according to §11 of the German Drinking Water Ordinance;
  • the Austrian Foodstuffs Book, Codex Chapter B1 Drinking Water 

The dosing of BWT Mineral F4 is carried out without any problems using DVGW/GS-tested BWT Mineral dosing devices from original containers. The dosing of BWT Mineral F4 is permitted according to the Drinking Water Ordinance up to 2.2 g P/m³ water. The BWT mineral substance dosing devices are set accordingly at the factory.

Technical details

Product number: 023658
Content: 10 l
Durability: Mind. 3 Jahre ab Produktionsdatum
For hardness range: F4 - Limescale protection for hard water from 21 ° dH total hardness
Total alkaline earths: 2,5 - 3,8 mol/m³


  • After opening, the contents of the container must be used within 6 months.
  • Storage life: at least 3 years from date of production
  • Storage temperature: 10 - 30 C
  • BWT active ingredients must be stored in a food-safe, frost-proof and dry place.
  • The products must be kept out of the reach of children.
BWT minerals are suitable for the treatment of drinking water for human consumption and, in terms of their purity and composition, naturally meet all the requirements of the Austrian Foodstuffs Code (Codex Chapter B1 Drinking Water) as well as the corresponding guidelines of the DVGW.
BWT Mineralstoffe F (3 litres) are designed for use in DVGW-tested BWT Bewados E3 liquid dosing devices. With each water withdrawal in the pipe system, less than 5 mg/l of the BWT mineral substance is added to the drinking water by the mineral substance dosing device.
When added to the drinking water, this reacts on the inner walls of the pipes and thus gradually forms a thin, but firmly adhering, protective layer that separates the water from the pipe (inner pipe sealing). Existing rust/corrosion foci are infiltrated (encapsulated). Regular water tapping at each tapping point is required.

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