I live in an area with very hard water. Instead of the universal one (scale appeared after the first boil), we took this cartridge Brita maxtra hardness - much better, but it lasted for 10 days maximum, then the whole kettle was covered with scale. I also tried the A6 aquaphor jug - the cartridge is cheaper and reduces hardness worse - the same 10 days, only scale appears in the kettle earlier and there is more of it than after shaving. In general, I stayed with a shave.
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