Pounds Formula

lb/day = MGD * mg/L * 8.34, with adjusted product feed at the chemical's purity.

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Formula and source

lb/day = flow (MGD) × dose (mg/L) × 8.34. Adjusted product feed = pure_lb / (purity %), keyed to the chemical: chlorine gas 100%, sodium hypochlorite 12.5%, calcium hypochlorite 65%, fluorosilicic acid 23%, alum dry 100% / liquid 48.5%, ferric chloride 38%.

AWWA M3 (Safety Practices for Water Utilities) by name; Water Environment Federation MOP-11 by name. The 8.34 factor is a physical constant: 1 gal H2O at 60 °F = 8.345 lb.

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