Rule 511-3-5-.08 - Filters(1)Design. Filters shall be designed and maintained so as to provide the water clarity noted in DPH Rule 511-3-5-.07(1)(e). (a) Filters shall be listed per NSF Standard 50 with the specific maximum flow rates per surface area based on media used.(b) The following filtration rates for the specific media shall be used in determining the filter area required for the circulation system:1. High-rate granular media filters shall be designed to operate at no more than fifteen gallons per minute per square foot when a minimum bed depth of fifteen inches is provided per manufacturer. When a bed depth is less than fifteen inches, filters shall be designed to operate at no more than twelve gallons per minute per square foot.2. The design filtration rate for surface-type cartridge filters shall not exceed three-tenths gallons per minute per square foot. One complete set of spare cartridges shall be maintained on site in a clean and dry condition.3. The design filtration rate for pre-coat filters shall be based on the following types: (i) Vacuum pre-coat filters shall not be more than either two gallons per minute per square foot, or two and one half gallons per minute per square foot when used with a continuous pre-coat media feed.(ii) Pressure pre-coat filters shall not be more than two gallons per minute per square foot of effective filter surface area.(iii) The filtration surface area shall be based on the outside surface area of the media with the manufacturer's recommended thickness of pre-coat media and consistent with their NSF Standard 50 listing and labeling. (c) Filters shall be designed so that filtration surfaces can be inspected and serviced.(d) Alternate types of filter media shall be listed and labeled to NSF Standard 50. (2)Internal Pressure. On pressure-type filters, a means shall be provided to permit the release of internal pressure. (a) Any filter incorporating an automatic internal air release as its principal means of air release shall have lids which provide a slow and safe release of pressure as a part of its design.(b) Any separation tank used in conjunction with any filter tank shall have a manual means of air release or a lid which provides a slow and safe release of pressure as it is opened as a part of its design.(c) Influent and effluent pressure gauges (if both are present in the system) shall have the capability to measure up to twenty pounds per square inch increase in the differential pressure across the filter bed in increments of one pound per square inch or less.(3)Instructions. Pressure filters and separation tanks shall have operation and maintenance instructions permanently installed on the filter or separation tank and shall include a precautionary warning statement not to start up the system after maintenance without first opening the air release and properly reassembling the filter and separation tank. The statement shall be visible and noticeable within the area of the air release.(4)Piping. Piping furnished with the filter shall be of suitable material capable of withstanding one and one-half times the working pressure. The suction piping shall not collapse when there is a complete shutoff of flow on the suction side of the pump.(5) A sight glass shall be installed on the waste discharge line of pressure filters so that the progress of filter washing can be observed.(6) All piping shall be marked with directional arrows as necessary to determine flow direction. All piping in the equipment room shall be permanently identified by its use and the pool and or aquatic feature it serves.Ga. Comp. R. & Regs. R. 511-3-5-.08
O.C.G.A. §§ 31-2A-6, 31-12-8, 31-45-10.
Original Rule entitled "Filters" adopted. F. Oct. 15, 2013; eff. Nov. 4, 2013.Repealed: New Rule of same title adopted. F. Jan. 11, 2017; eff. Jan. 31, 2017.