Ariz. Admin. Code § R18-5-231
The water circulation system shall include a removable strainer located upstream of the pump to prevent solids, debris, hair, or lint from reaching the pump and filters. The strainer shall be made of corrosion‑resistant material. A strainer shall have openings that have a total area which is equal to at least four times the area of the suction piping.
Adopted effective February 19, 1998 (Supp. 98-1).