H2O That Is Prone to Causing Limescale

This page is the CodyCross answer for the clue below from Spa Time, Group 818, Puzzle 4 (Skin Kneading).

Question is: H2O That Is Prone to Causing Limescale

and the answer is: HARDWATER

Word Meaning:

HARD WATER — (chemistry) Water with a high concentration of dissolved minerals, especially calcium, making it difficult to lather with soap.

Definitions from Wiktionary.