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Jo.tion 7801 - Filter requirements general. <br />L Approved filters according to standards required by State Department of <br />Public Health and Local Health District. <br />XV - Section 7802 - Rapid sand pressure filters <br />'‘e) 1. Filter rate not to exceed three (3) gpm/ so. ft. Backwash rate not less <br />than twelve (12) gpm/ sq.ft. <br />Itt_e) 2. Media: At least twenty (20) inches depth of filter sand, not less than <br />tan 10) inches filter gravel above the underdrain system. <br />)11P1. 3. Effeetive sand size three tenths (.3) to five tenths (.5) millimeters <br />graded gravel and placed as per paragraph (d) of this Section 7802. <br />4. Sigh e glass on waste discharge line. <br />U‘h a. Air release valve at high point of filter. <br />Laz b. Adequate faeilities with dosage control for adding coagulating <br />chemicals ahead of filter. <br />e. Filter piping valved for separate filter backwashing and for filter <br />isolation for repairs while other units in sereec. <br />Jectien 7803 - Diatemaceeus earth filters <br />4he 1. Filter rate, two (2) gm/sq. ft., maximum of two and one half (2) gpm/ <br />sq. ft., if continuous feeding of filter aid material provided for. <br />2. Pooh with surface area of sq., ft., r more and heavily used <br />shall have continuous feeding of filter aid material, Lc filter infl.;ent <br />at a minim= rate of 0,1 pounds per square foot of filter area over a <br />twenty four (24) hour period. <br />3, Materials adequate to withstand normal continuous use without deterioration, <br />shall he used. <br />L. Provision for convenient filter cleaning shall be provided. <br />Fresaure-type unito pamps shall deliver full required capacity at a head <br />loss of sixty (60) percent or more of such capacity at seventy 10) <br />feat head less thru the discharge lines. <br />aacutm-type unit, pm shall have filter flow at a vac.uum pltge reading <br />of sixteen ,16) :_nt-h61.1 of mereury to provide for suction head plus head loss <br />thru the discharge piping anel fittings. <br />XVII - Section 7804 - Other filters (sufficient factual data shell be submitted to <br />health officer for approval or disapproval) <br />LVIII - Sectien 7805- Suction cleaner and piping for all recirculating type <br />swimming pools. <br />Suction cleaner either built-in or portable type, able to reach all <br />sectons of pool <br />Jet eype units to be provided with backflow protection. <br />EH. 12 Rev. 5/69