The water in the well is very hard, and after the second boiling, scale deposits already start to form. After two weeks, you have to clean the kettle from it. However, after running the water through the filter, the water is soft, and after boiling for two weeks, nothing has scaled up. It is obvious that the cartridge will eventually run out of resources, and scale will start to appear, but for the time being, everyone is happy with everything. In theory, this flaw is not extremely irritating. However, when I printed the filter, it had some sort of soot on it. Hopefully, this won't be the case when it is in use.
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