Nope - it totally bypasses the filter and goes out the waste line. Backwash reverses the water flow through the filter and then out the waste line - used to clean the filter grids of accumulated dirt; "Rinse" = "filter to waste" - it runs water through the filter and out the waste lane.
I can vouch for that. Here in NE Florida we've been having a lot of rain. Sometimes as much as 3-4 inches in an hour. So I've needed to drain some of the water from the pool frequently and in these situations use filter to waste.
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