Abstract
EFFECTIVE reduction of turbidity and removal of bacteria by filtration of normal surface waters through coarse-grained filter media have been reported, but, for the most part, the reports have been sketchy and without substance. Exceptions are the reports by Suter {1, 2) of ground water recharge experiments at Peoria, 111., where 4-5 -mm pea gravel removed silt and bacteria from Illinois River water without the hydraulic restriction and rapid clogging customary with filter sand. The effectiveness of filtration with
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