(1) The piping system shall be designed to reduce friction losses so that adequate flows are maintained in the piping system. The piping system of the pool shall be painted in distinguishing colors to determine filtered water, make-up water, waste water, vacuum lines and heating lines. The color system for distinguishing the different piping systems in a swimming pool or spa shall be as follows:

(a) green             --            filtered water

(b) yellow            --             raw or make-up water

(c) black             --             waste water

(d) red                --             heating lines

(e) blue               --             vacuum lines

(f) orange           --             unfiltered water

(g) The piping system may use labels stating the pipe function with direction of flow arrows as an acceptable pipe identification method alternative to color coding.