Calcium Build-Up in Kettles and Domestic Pipes

This page is the CodyCross answer for the clue below from Taking Care of Our Planet, Group 1570, Puzzle 4 (Biodegradable).

Question is: Calcium Build-Up in Kettles and Domestic Pipes

and the answer is: LIMESCALE

Word Meaning:

LIMESCALE — A white, chalky deposit of calcium carbonate found in kettles, washing machines etc., especially in a hard water area.

Definitions from Wiktionary.

Calcium Build-up In Kettles And Domestic Pipes - Taking Care of Our Planet CodyCross Answers | CodyCross Solutions