Hi i have a question, whos picture is a best performance ?
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Low ?
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Best ?
I would not say performance. This is an option to set what turnover rate you want your skimmer. The first pic i would say is set up to remove stubborn DOCs because it has a lower turnover rate(Water moving thru the skimmer/Contact time) = time in skimmer body.
Pic number 2 is more water through the skimmer = less contact time. Which would be good say you have a contaminant like an anemone spawn or a bak bloom you want to clear up fast.