Waterguide - Birm
This filter medium is an aluminium silicate that is coated in manganese dioxide. If the conditions allow, air pockets are used instead of chemicals. In this case the filter medium just needs backwashing with water. The filter medium acts as a catalyst to enhance the reaction between dissolved oxygen and the iron compounds, changing the Fe2+ into Fe3+ and resulting in the formation of iron hydroxides. These iron hydroxides precipitate which makes them easy to filter.
Bulk density 0.56 – 0.64 kg/l
Particle size 0.4 – 2 mm
The filter medium Birm can be used to remove the following substances: