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b, Media - 2u inch einimum 6epth of sand and IC tnch minimum depth
<br />gravel over under drain,
<br />Effective sand size 0,3 to 0,5 ram, d, Gravel graded and placed
<br />as per Sec. 7802. e, 12 inches freeboard above sand,
<br />f. Sight glass on waste 6 ieg. Air release valve at
<br />high point of filter. h. Adequate facilities with dosage control
<br />for adding coagulating chemicals ahead of filter,
<br />1. Filter piping valved for separate filter backwashing and filtration,
<br />2. SEC. 7803 - DIATOMACEOUS EARTH FILTER
<br />a. Filter rate - two gom/sq. ft., maximum of two and one half (2*)
<br />gpm/sq, ft, if continuous feeding of filter aid material provided for,
<br />b,. Pools 2,000 sq0 ft, or more and heavily used pools must have continuous
<br />feeding of filter ale'l material at a minimum rate of' 0,1 • ds/sq, ft,
<br />of filter area over a ',L4 hour period. Individual eki_m-filter units
<br />not allowed on pools 2,000 sq, ft, or more,
<br />Materials adequate to withstand normal use,
<br />Provision for convenient TAlter cleaning,
<br />C,, Pressure-type units pume -eust deliver full reeuiree' ereeeure at 60
<br />feet head loss and sixty Iiercent (60%) or more of such capacity at
<br />70 feet head loss,
<br />3n SEC, 7804-OTHER FILTERS (Sufficient factual date shall be sebmitted to
<br />the Health Department fer aeoroval or disanprovau.
<br />1.1„ SE, 7774-'flADING POOL- CAPACITY GALS.
<br />1. Maximum depth at deep point, 18'' at side walls, le.
<br />Uater recirculated at two-hour or less turnover rate, SEC,?931,
<br />Chlorine residual of at least 0,4 Ppm at all times when in use.
<br /> 4c Main drain for discharging pool water provided,
<br />N. SEC, 7797-WATER SUPPLY
<br />,No direct connection of water system with pool waer, (No hose filling or
<br />direct make-up unless protected by vacuum breaker),
<br />Pc 2, Convenient hose bibs equipped to V,B,'s to enable hosing down of pool area,
<br />SEC, 77990
<br />C/3n Water system under permit or from source approved by the Health Deoartment,
<br />If water supply from well, sanitary construction must eeet Health Department
<br />approval,
<br />Guarded jet angle drinking feuntains provided at all pools except where
<br />provided in adjacent living querters, SEC, 7793,
<br />EJL -12
<br />9/61
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