Our SWG down here are usually a bit different to the US ones. They regulate chlorine production by adjusting the current rather than a duty cycle to start with. This also allows us to run them over a higher salt range which is used to compensate for reduced performance at lower temperatures, and we are usually able to run them all through winter.They might not be able to deliver the max. output, which is not required in winter anyway.
They also usually are designed for the pump being controlled by the SWG to ensure that the pump is on when the SWG is on. The US models are often independent from the pump and use flow meters to make sure that water is flowing when the SWG is on.
Ours usually don't have real flow meters.They will detect emergency situation like a fried pump by the cell current not behaving as expected and then shut themselves off.
That's why all this advice here on min flow to keep the flow sensor going don't really apply for us.
I would run on a speed that keeps the cell properly flushed (our cell housings are usually clear and we see what's going on inside).
What's important to me us that my pool gets actually properly skimmed, and on very low speeds I don't get much skimming done. That's what defines my min speed rather than the SWG.
As an everyday speed, about 1800-1900 works fine for me. When I hook up my suction cleaner I sometimes go up to 2100 to speed things up.
