This is an effective method of water demineralisation. A chemical reaction that occurs during water filtration enables total removal of ionic substances. Filtration takes place in separate cylinders with appropriate backfilled bed (filtering medium), which are controlled with an automatic control valve. Water demineralisation systems operate in a hydrogen (acid) and hydroxide (alkaline) mode. The media require periodic regeneration.
Professional water demineralisation systems, based on ion-exchange properties of the applied filtering media. Depending on the type and requirements of the industrial system, two types of filters may be used: a single device filled with mixed medium or a system consisting of two ion exchange columns, one of which is filled with strongly acidic cationite and the other one - with basic anionite. In most cases more complex solutions are used. Such water demineralisation systems usually appear in form of four cylinders (i.e. two sets). Each pair is supplied with a tank for chemicals with a regenerants. Cationite and anionite are regenerated separately.