For most of the country, hard water is a way of life; the only difference may be in the degree that you have it. So how does hard water effect pressure washing and what can be done about it?
First, let’s discuss where hard water is found and where it comes from. Water hardness is rated by GPG – grains per gallon – and hard water, higher than 1 GPG, includes 85% of the country. The amount of hardness will vary from slight to extreme (see map below). Rainwater dissolves minerals present in rocks as it passes though the ground down to the water table, aquifers and wells. Carbon dioxide, being heavier than air, also combines with rainwater underground and helps convert the carbonates of calcium and magnesium into bicarbonates. These bicarbonates, being soluble in water, cause hardness. These bicarbonate salts exist in the form of positive and negative ions, which can be used, as you will see later, in ways to help incapacitate or remove them by certain methods, one being ion replacement. [Read more…]