The best replacement for kalkwasser is calcium reactor.

The best alternatives to kalkwasser are rated as following:
★★★★★  calcium reactor
★★★★  2 part
★  pickling lime
★  two part

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Speaking about kalkwasser, one probably shouldn't forget about auto top off.

Other search terms related to kalkwasser and their ratings are:
★★★★★ auto top off
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kalkwasser
calcium reactor
2 part