Investigation of E. coli and Virus Reductions Using Replicate, Bench-Scale Biosand Filter Columns and Two Filter Media.

coli increased substantially as Q I /Q I,o declined, as illustrated in Figure 8 ; comparing samples collected on days with Q I /Q I,o > 0.2 to those < 0.2 yielded a highly significant difference for both Accusand and granite columns ( p < 0.0001).

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