German standards

Although the concept is relatively unfamiliar in the United States and largely untested here, pools supported by an entirely natural approach to filtration and water management have been under development in Europe for decades and have caught on there in a big way in recent years.  In this special feature, German watershaper and natural-pool expert Rainer Grafinger discusses the ‘technology’ behind this potent European trend. For most people in the United States, swimming is far from a natural experience:  Bathers move back and forth in man-made, chemically treated backyard or public swimming pools and seldom (if ever) find themselves in