One of the most important things you can do for your pool or hot tub is to test your water. Regular water testing allows you to see how your “water balance” changes over time.
Water balance is the relationship between different chemical measurements in your pool or hot tub water. It is based around the fact that water dissolves and holds minerals until it becomes saturated and cannot hold any more. We will refer to this as the water’s “saturation point”.
Water that is below the saturation point is corrosive. It tries to saturate itself by dissolving everything it comes in contact with.
Water that is above the saturation point is scale forming. It can’t hold all of the minerals that are dissolved in it. These excess minerals group together and form scale on any surfaces within the water.
Water that is well balanced is neither corrosive nor scale forming. This is the water that you want in your pool or hot tub!