Step 3.B – Correction Amount
In order to get baseline settings, the correction amount will be determined by the following parameters:
- Incoming Water Residual Concentrations
- Outgoing Water Residual Target
- Daily Usage or Flow (Millions of Gallons Per Day, MGD)
- Tank Volume or Size (Millions of Gallons, MG)
Since usage is generally cyclical over a 24-hour period, we define “low turnover” as daily flows less than the tank volume.
Conversely, “high turnover” is daily flows exceeding the tank volume.
If the incoming water is generally at the Target Residual level, the Desired Increase (Eq. 3) should be equal to the residual
loss that typically occurs in the tank. The system must have the capacity to increase all water by the Desired Increase
(Eq. 3). Additional capacity is also recommended, as tank-specific factors such as usage variability, loss of residual, fill
rates, etc. may impact chlorine demand. As a starting point, 30% additional capacity may be used for many applications.
For initial settings, this daily volume should be distributed into 2-4 Corrections Per Day.
- If low turnover, or incoming water is generally “good” (close to or above target residual), less reactive dosing may
be used (lower number of corrections)
- If high turnover and incoming water has low residual, more reactive dosing will be required (higher number of
corrections)
- At this point, a check should be made to ensure the incremental correction amount is deemed acceptable by the
operator. If the amount is too high, increase the number of corrections to lower the incremental correction amount.
Once an acceptable incremental volume is found, the Feed Rate and Feed Duration (Eq. 7) may be set. For standard
units, a starting Feed Rate of 1.25 GPH may be used. This is approximately equal to 50% of the standard unit’s capacity,
and allows flexibility in further tuning.
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Initial Settings
Initial Settings
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