Water Hardness Scale

413 × 160

Hardness of Water
Water Hardness Scale

From: https://sciencefaircenter.com/wp-content/uploads/2012/12/TotHardnessITSFCScale4x722.jpg

https://sciencefaircenter.com/wp-content/uploads/2012/12/TotHardnessITSFCScale4x722.jpg