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Its really simple to find dwell time if you have the flow through rate of the skimmer and the volume.
Anyone can find the flow through rate of their skimmer by timing how long it takes to filled a gallon bag, for example. The volume is also really simple is you know the measurements of the skimmer.
Anyways that is why i said it is really easy to find dwell times for recirc skimmers because these values are all know and made available by the skimmer manufacturers most of the time.
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