Aine puhtus

Water sufficiently clean for plants and animals is often too polluted for swimming. We cannot trust the water at swimming spots for consumption. Purified drinking water may spoil a photographer's film, and a chemist's distilled water is inadequate for pure chemistry. Bidistilled water and deionized water represent steps toward purity, a pinnacle that remains elusive. This book explores the concept of purity: what it is, its benefits, how it is attained, and why absolute purity is unattainable