R 325.2126 Water supply backflow.

Rule 26. (1) A swimming pool owner shall ensure that a potable water supply system that serves a swimming pool and all plumbing fixtures is protected against backflow. A swimming pool owner shall ensure that potable water which is introduced into the swimming pool or recirculation system is supplied through permanent piping and either of the following: (a) An acceptable air gap consisting of an unobstructed vertical distance through the atmosphere of not less than 2 diameters of the water supply pipe between the lowest free- flowing discharge of the water supply pipe and the overflow level of the receiving pipe, tank, or vessel. (b) An approved reduced pressure zone backflow preventer which is installed where it is readily accessible for inspection and maintenance, which is not subject to flooding, and which does not have a direct connection between the drain port and a wastewater system. (2) A swimming pool owner shall ensure that a water supply fill spout is located so that it is not a safety hazard.