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XIV - Section 7801 - Filter requirements general. <br />1. Appr3ved filters according to standards required by State Department of <br />Public Health and Local Health District. <br />XV - Section 7802 - Rapid sand pro:inure filters <br />1. Filter rate not to exceed three (3) gpm/ sq. ft. Backwash rate not less <br />than twelve (12) gpm/ sq.ft. <br />.6,1Ly 2. Media: At least twenty (20) inchoo depth of filter sand, not lesa.than <br />tan (10) inches filter Gravel above the underdrain system. <br />_LLD 3. Effective sand size throe tenths (.3) to five tenths (.5) millimeters ' <br />graded gravel and placed as per paragraph (d) of this Section 7802.: <br />Sight glass on waste discharge line. <br />_LI a. Air release valve at high point of filter. <br />b. Adequate facilitiea with dosage control for adding coagulating <br />chemicals ahead of filter. <br />Filter piping valved for separate filter backwashing and for filter <br />isolation for repairs while other units in service. <br />XVI - Section.7803 - Diatomaceous earth rilters <br />Filter rate, two (2) gpm/sq. ft., maximum of two and one half (21) gpm/ <br />sq. ft., if continuous feeding of filter aid material provided for. <br />Poole with surface area of 2,000 sq. ft., or more and heavily used pools <br />shall have continuous feeding of filter aid material s to filter influent <br />at a minimum rate of 0.1 pounds par square foot of filter area over a <br />twenty four (24) hour period. <br />Materials adequate to withstand normal continuous use without deterioratione <br />shall be used. <br />Provision for convenient filter cleaning shall be Provided. <br />Pressure-typo unit,pumps shall'deliver full required capacity at a bead <br />loss of sixty (60) percent or more of such capacity at seventy (70 <br />Loot head loss thru the discharge lines. • <br />Vacuum-type unit, pump shall have filter flow at a vacuum gauge reading <br />of sixteen (16) inches of mercury to provide for suction head plus head lose <br />thru the discharge piping and fittings. <br />XVII - Section 7804 - Other filters (sufficient factual data shall be submitted <br />boalth officer for approval or disapproval) <br />XVIII ... Section 7805- Suction cleaner and piping for all recirculating typo <br />swimming pools. <br />Suction cleaner either built-in or portable type, able to reach all: <br />sections of pool <br />Jet type units to be provided with backtlow protection. , <br />6. <br />to , <br />,t <br />' <br />tl <br />E. H. 10 .06 <br />121,211t