I use it for over 12 years and never had problems with lime, despite hardness 3 (21 ° dH). For me, however, and environmental awareness is also very important, since a corresponding higher dose of detergent also brings substances into the environment which are unnecessary, the only for softening need higher doses no detergent substances etc.. And just at higher hardness is required but much more detergent. So you take only the dose for soft water (hardness 1) of detergent and complements the rest by Calgon according to the existing degree of hardness. In order to protect water / environment, as less critical chemicals unnecessarily come into the environment.
