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• <br />)3N - Section 7801 - Filtor requiremento general. <br />•••••••••• <br /> 1. Apprxied filters according to standards required by State Department of <br />Public Health nud Local Health District. <br />XV - Section 7802 - Rapid sand prussuro filters <br />Filter rate not to exceed three (3) gpm/ eq. ft. 'Backwash rate not leas <br />than twelve (12) gpm/ ag.ft. <br />Media: At leaat twenty (20) inchoa depth of filter sand, not lesa.than <br />tan (10) inches filter gravel above the underdrain system. <br />Effective sand size three tenths (.3) to five tenths (.5) millimeters <br />graded gravel and placed as per paragraph (d) of this Section 7802: <br />lb 4. Sight glass on waste discharge line. <br />Air release valve at high point of filter. <br />Adequate facilities 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 filters <br />12• <br />\ <br />aniiti;\ <br />4,1 <br />,l. Filter rate, two (2) gpm/sq. ft., maximum of two and ono half (21) gpm/ <br />sq. it.., if continuous feeding of filter aid material provided for. <br />Pools with surface area of 2,000 sq. ft., or more and heavily used pools <br />shall have continuous feeding of filter aid matorial,to filter influont <br />at a minimum rate of 0.1 pounds por square foot of filtor area over a <br />twenty four (24) hour period., 1 <br />3. Materials adequate to withstand normal continuous use without deteriorAtioni, <br />shall be used. <br />14. Provision for convenient filter cleaning shall be Provided. <br />/ Pressure-typo unit,pumps shall deliver full required capacity at a head <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 loss <br />thru the discharge piping and fittings. <br />XVII - Seotion 7804 - Other filters (sufficient factual data shall be submittodite , <br />health officer for approval or disapproval) <br />XVIII ei Section 7805- Suction cleaner and piping for all recirculating type <br />swimming pools.. • <br />1. Suction cleaner either built-in or portable type, able to reach aU <br />sections of pool 1 <br />.1../6 2' Jet type units to be provided with baok.flow proteotion. <br />E. H. 10 06