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(1) Rapid and filter. A filter utilizing sand as <br />the filter media, with filtration flow rate no5 exceeding three <br />(3) gallons per minute per square foot (122 liters per minute <br />per square mener) of filter area. The backwash rate of flow <br />shall be three (3) times the filtration rate. <br /> <br /> (2) Anthracite filter. A filter utilizing <br />anthracite as a filter media, with filtration flow fane not <br />exceeding three (3) gallons per minute per square foot (122 <br />liters per minute per square mener) of filter area. The <br />backwash rate of flow shall be three (3) times the filtration <br />rate. <br /> <br /> (3) High rate filter. A filter uni!izing a media <br />capable of filtration an a high rate of flow. The rate of flow <br />shall be greater than five (5) gallons per minute per square <br />foot (203.7 liters per minute per square meter) of filter area. <br />The backwash tame of flow shall be the same as filtration rate. <br /> <br /> (4) Diatomaceous earth filter. A filter utilizing <br />diatomaceous earth as a filter media. There are two (2) types <br />of these filters. <br /> <br /> a. Pressure or vacuum-type. A diatomaceous earth <br />filter through which the tame of flow does nom exceed two (2) <br />gallons per minute per square foot (81.5 liters per minute per <br />square mener). <br /> <br /> b. Pressure or vacuum-type with slurry feeder. A <br />filter equipped to continuously feed a diatomaceous earth <br />suspension and having a rate of flow not exceed three (3) <br />gallons per minute per square foot (122 liters per minute per <br />square meter). <br /> <br /> A backwash sump pit with a stand pipe shall be installed <br />to collect spent diatomaceous earth so that it can be collected <br />and disposed of with solid waste. Any other method for <br />accomplishing this may be submitted for consideration. <br /> <br /> Other filtration systems which are equal to or better than <br />those described above may be used in a pool recirculation <br />system with the approval of the administrative authority. <br /> <br /> (c) Gauges. Gauges shall be installed as required, on <br />all filter systems to readily indicate the operating pressures <br />of recircuiating systems. All gauges shall measure pressure <br />directly in pounds per square inch or kilograms per square <br />meter and shall have an indicator at least two (2) inches (5.08 <br />centimeters) in diameter. <br /> <br /> <br />