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C. Filter addition: Contractor to provide an additional PacFab, Triton, TR140C <br /> sand filter, identical to the existing units with an identical slide-type <br /> backwash valve. Filter shall be filled 25% with water prior to the addition <br /> of three (3) cubic feet of pea gravel and 6.5 cubic feet of#20 silica sand <br /> designed for pool water filtration (size co-efficient of 1.5). Fit filter with <br /> and influent and effluent pressure gauge. <br /> Contractor to rebuild the existing filter manifold with 4" PVC plumbing. <br /> Support manifold as drawn. <br /> END <br /> 8 <br />