Plumbing Code Requirements and Sizing Guide for Residential Water Softeners Plumbing Code Requirements and Sizing Guide for Residential Water Softeners
7/12/2002 (PDF - 314kb)  Plumbing codes list minimum performance requirements for potable water supply and distribution systems. Since water softening devices are an integral part of many residential water supply systems, it is imperative for water softeners to be constructed, sized, and installed in accordance with the provisions of nationally recognized performance standards and the model plumbing codes. | 
