Why deionized water? The water here in Arizona is “hard” water. This means that it has a relatively high concentration of calcium and magnesium ions. The description of water being “hard” is because it is hard or difficult to get a good lather with soap, and makes the water difficult to work with. The biggest challenge in cleaning anything with hard water is not so much in the washing step, but in using hard water to rinse. The excessive calcium and magnesium bicarbonates in our water supply combine with soaps and detergents to form “soap curd,” an insoluble material that leaves a soap scum on anything cleaned with it. The minerals in our water also leave hard water spots on your RV, park model, or vehicle. These spots are difficult and often nearly impossible to remove.
During the process of deionization, positive hydrogen ions (H+) and negative hydroxyl ions (OH-) are exchanged for the positive and negative contaminant ions in the water. Since all or most of the mineral content is removed during the deionization process, it cleans more effectively and leaves no residue on your RV, park model, or vehicle.
In contrast with the deionization process that removes minerals on a molecular level, reverse osmosis, while certainly better than nothing, does not achieve the level of mineral removal possible with deionization. Reverse osmosis forces water through a semi-permeable membrane, removing some, but not all of the contaminants found in our water.