Section 18.30.535. Circulation and filtration.

	(a)  A pool must have a complete circulation system, including pumping equipment, filters, balancing tanks, valves, pipe connections to the inlets and outlets of the pool, and provisions for cleaning the filters.  
	(b)  At least three turnovers of the pool water are required every 24 hours.  
	(c)  Skimmers will, in the department's discretion, be approved under 18 AAC 30.955.  
	(d)  Hair and lint catchers must be used in pressure filter systems and must be  
		(1) corrosion-resistant, with openings to provide a free flow area at least four times the area of the pump suction line; and  
		(2) readily accessible for frequent cleaning.  
	(e)  The piping system of a pool must be built to prevent  
		(1) wastewater from entering the circulation system of the pool; and  
		(2) water from the circulation system from entering the make-up water supply.  
	(f)  Water velocity in pipes may not exceed six feet per second.  
	(g)  Balancing tanks are required on all filter systems. For pools built or extensively remodeled after 12/23/93, the capacity, in gallons, must be 15 times the maximum bathing load. Vacuum filter systems may use a combination surge/filter tank.  
	(h)  The size of the circulation pump is determined from total dynamic head including maximum head loss through the filter, and from velocities required for backwashing.  
	(i)  The department will, in its discretion, waive circulation system requirements for flow-through pools if  
		(1) the water supply provides at least three turnovers of the pool water every 24 hours;  
		(2) the water supply meets the requirements of 18 AAC 70.020 for contact recreation and 18 AAC 30.550, and is disinfected as set out in 18 AAC 30.540;  
		(3) fresh treated water is introduced into the pool by the same type of inlet design required by 18 AAC 30.520(a); and  
		(4) drain outlets meet the requirements of 18 AAC 30.520(c).  
	(j)  Filters must completely drain by gravity.  
	(k)  If diatomaceous earth filters are used, disposal of the used diatomaceous earth must be approved by the department.  
	(l)  Cartridge filters will, in the department's discretion, be allowed, if a waiver of provisions is granted under 18 AAC 30.955.  
	(m)  Sand filters must be physically inspected by the operator at least once each year for channeling, buildup, compaction, or other flow resistance factors. Filter media must be replaced, if channeling, buildup, compaction, or any other flow resistance factor is observed. All inspection dates and results must be noted by the operator on the pool log.  

Authorities

44.46.020

Notes

Reference

18 AAC 30.500

Authority

AS 44.46.020

History

Eff. 6/4/83, Register 86; am 12/23/93, Register 128