Section R. 325.2144 - Surface skimmers and surge weirsRule 44.
(1) A swimming pool owner shall ensure that a swimming pool, other than a spa pool, which is equipped with surface skimmers or a perimeter overflow system that has surge weirs has at least 1 surface skimmer or surge weir for every 500 square feet of water surface area or fraction of 500 square feet. A swimming pool owner shall provide additional surface skimmers or surge weirs if necessary for effective skimming or to meet the surface skimmer hydraulic design requirements.(2) A swimming pool owner shall ensure that a spa pool has 1 surface skimmer for every 250 square feet of surface area or fraction of 250 square feet.(3) A swimming pool owner shall not provide a spa pool, a river ride pool, or a wave pool equipped with a perimeter overflow system with surge weirs.(4) A swimming pool owner shall ensure that a surface skimmer or surge weir is in compliance with both of the following provisions: (a) Is designed to effectively remove floating material from the water surface.(b) Is located to ensure proper skimming of the entire water surface with minimum interference and minimum short-circuiting.(5) A swimming pool owner shall ensure that a surface skimmer meets all of the following requirements: (a) Has an automatically adjustable weir.(b) Has an easily removable and cleanable strainer basket.(c) Has a flow rate control device.(d) If an equalizer pipe is provided, the pipe has a device that will remain tightly closed under normal operating conditions.(e) Is built into the swimming pool wall and does not create a safety hazard.(6) A swimming pool owner shall ensure that a swimming pool recirculation system is designed for a flow of 37.5 gallons per minute per surface skimmer with 80% of the flow (30 gallons per minute) to be directed through the skimmer and 20% of the flow (7.5 gallons per minute) to be directed through the main drain.(7) A swimming pool owner shall ensure that a surface skimmer piping system is equipped with a means to adjust the flow through each skimmer either in each skimmer or in the equipment room as close as practical to the pump suction to provide for uniform surface skimming and to allow balancing of flow between the skimmer system and the main outlet system.(8) A swimming pool owner shall ensure that a surge weir for a perimeter overflow system meets all of the following requirements:(a) Is designed to effectively skim the water surface.(b) Is designed for a minimum flow rate of 50 gallons per minute and for 20 gallons per minute per lineal foot of weir.(c) Is designed to effectively close during periods of use when rim flow is necessary.(d) Is built into the perimeter overflow system and does not create a safety hazard.Mich. Admin. Code R. 325.2144
1979 AC; 1983 AACS; 2001 AACS