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.