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The alum doses delivered by both the original PVC lever arm and the aluminum model were measured. The alum dose was determined by measuring the flow rate delivered by the CDC. The dose was then calculated using the equation:

{latex}
\large
$$
C_{dose}  = {{Q_{FCM}{C_stock} } \over {Q_{plant} }}
$$ {latex}

where:

• C _dose was the alum dose
• Q _FCM was the alum flow rate
• C _stock was the chemical stock concentration
• Q _plant was the plant flow rate

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