The replacement filters are part of Grünbeck filter system. The effect of this filter is the removal of pipe sediment to avoid clogging and corrosion in aerators, coffee makers, kettles Wesser, warning water tanks. Who here wants to extend the life of its equipment and the repair intervals, for those are the replacement filter a real buy recommendation.
Basically, who in addition will still taste prepare its drinking water, the upstream Grünbeck filter system needs because otherwise devices for ionization and carbon filtration through pipe sediments are set rather quickly.