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U. Fflter Requirements (2-9036 through 2-9039) <br />NA. Rapid sand - maximum 3 GPM/sq. it.; P6I(kw: sh minlmum 12 GPM/sq. <br />ft. <br />OK, 2. D. E. - maximum 2 GPM/sq. it., maximum 2 1/2 GPM for continuous <br />feeding of filter aid for pools 2000 square feet or more. <br />High rate sand - suggested maximum 15 GPM/sq. ft.; backwash <br />minimum 15 GPM/sq. ft. <br />V. Disinfectant Feeder (2-9041) <br />Et,* Approved type. <br />ri1 2. If gas chlorine, scale required. <br />W. Skimmers (2-9042) (pool area not over 5000 square feet) <br />014-1. One skiver for each 500 sq. ft. or fractional part thereof. <br /> <br />OW 2. Capable of withdrawing minimum 75% required recirculation <br />capacity. <br />Gate valve. <br />OK4.- Equalizer line. <br />X. Perimeter Overflow (2-9042) (Required for pools over 5000 square feet.) <br />1. Capable of withdrawing minimum of 757. required recirculating <br />capacity. <br />Channel minimum 3 inches deep; bottOm width of channel minimum 3 <br />inches; opening beneath deck into channel miniuum 4 inches. <br />Channel lip maximum 12 inches below top of deck; rounded lip edge <br />maximum thickness 2 1/2 inches for top 2 inches, minimum thickness <br />1 inch for top 2 inches. <br />Channel outlet minimum 2 1/2 inches spaced not more than 15 feet <br />apart and channel slope to outlets not less than 1/4 inch/ft. <br />Channel drain grates 1 1/2 times area of outlet pipe. <br />Surge tank storage minimum 1 gallon/sq. ft. of pool surface. <br />Automatic surge flow control to make-up warer'with manual override <br />for maintaining pool water level. <br />Y. Bottom Drain (2-9042 and 2-9013) <br />(AC1. Designed so that the pool can be emptied. <br />(51(2. Aate valve. <br />2.