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§ 20-34 MARTINSVILLE CODE Sec. 20-34. Filtration system Igenerally. (a) The recirculation system required ,by this article shall be equipped with a filtration system that will f~l~er the entire content of the swimming pool within eight (8) or less hours at the rate ~f ~hree 1(3) gallons or less per square foot of filter area for rapid; sand filters and ~z~enty 1(20) gallons or less per square foot of filter area for high-rate filters. Pressure filters Shall be equipped with 'readily accessible air relief valves and with an access hole large enough to permit inSpections~ maintenance and repair work. Each pressure filter. system shall be equipped with a pressure gauge, at least four (4) inches in diameter, on the inlet and outlet to indicate the pressure in pounds per square inch, and a sight glass that can be easily removed for cleaning shall be provided on the waste discharge line. Gravity type filters shall be equipped with loss-of-head gauges. (b) The filtration rate for diatomaceous earth filters and similar equipment may not exceed one and 0ne-half (1%) gallons per square foot of filter area, with eight (8) hours turnover of pool volume, unless continuous slurry feed is provided, in which case the rate shall not exceed three (3) gallons per square foot of filter area. (c) Arrangements or equipment shall be provided for application of filter aid and for proper precoating and cleaning of filter elements. All filters shall be so designed and' capable of being cleaned or backwashed by use of the wash-water pump and the manipulation of valves. In view of the constant change of design of such equipment, it will be necessary to evaluate each system individually, and approval or rejection will be at the discretion of the director of public health, based upon the need for protecting the health and safety of thos~ using the pool. (Ord. of 5-10-77, § 9-1.715]) Sec..20-35. Filter room. (a) Any room containing the filtration equipment, pumps and other recirculation system appurtenances for a swimming pool shall be finished in a light color and be provided with adequate illumination and ventilation. The floor of the filter room shall be designed to provide adequate drainage. The provision of any facility for discharging filter backwashing water onto the filter 'room floor is strictly prohibited, and adequate provision shall be made for the discharge of backwash water. All of the recirculation equipment in such room shall be installed so that it is easily convenient to operate or repair. All entrances below ground surface shall be by stairway and vertical door. Adequate headroom shall be provided above all filters. Below ground filter rooms shall be provided with mechanical ventilation. (b) A placard shall be prominently displayed in the filter room showing the following data: Size. of ~he swimming pool in feet and volume in gallons, capacity of the filters in square feet and gallons per minute, capacity of the pumps in gallons per minute at' the appropriate head in feet, head loss at which the filters should be backwashed and complete instructions for operating the recirculation and disinfection equipment. (Ord. of 5-10-77; §§ 9-1.712], 9-1.815]) 1194