There are two forms of minerals, inorganic and organic.
Inorganic minerals refer to non-vegetable or non-animal matter,i.e. not living. These include calcium, iron, and magnesium found in water. Since these components are non-living, our bodies find it difficult to make use of these minerals and our cells reject them. The result of ingesting inorganic minerals is an accumulation of debris in our bodies.
Organic minerals on the other hand are living, and are found in vegetables, fruit, grains, meats and nuts which form our daily diet. These minerals are easily assimilated by our cells and are essential for good health. If you rely on water as a source of your required minerals, you will be greatly lacking.
Over 95% of minerals ingested daily come from food and less than 5% from water. As an example, an 8 ounce glass of milk contains more calcium and magnesium than 5 gallons of water. Some inorganic minerals such as nitrates, cadmium and lead can be harmful to human health. Knowing this, doesn't it make sense to remove all inorganic contaminants, chemical, bacteria and other impurities from drinking water and rely on our foods for the useful minerals we require for good health?