Water Hardness Overview

Water is fundamental to our survival in that it makes up over 70% of our bodies and we can survive for no more than 5 days without water. Over two thirds of the earth is covered with water, however less than 3% of this water is fresh water in the sense that it has the potential to be consumed by humans in its natural state and three quarters of this water is frozen. Less than 0.5% of all water is found underground and approximately only 0.02% of all water is found in lakes and streams.