eh, on my system, the floor jets shoot toward the center main drain, so at low speed you're barely getting the dirt off the ground, let alone pushing it the 8 feet to the main drain. I do brush once a week or so, but it would settle before the drain had a chance to get it, if it's just low speed. Plus the new main drains have the suction spread way out along the rim, child drowning prevention standards, so they don't really "suck" as well.
We also gets lots of bugs and beetles in the pool. So skimming is important.
So, for me: 80% speed from 8am-1pm. then 80% again from 9pm to 9:45; I add my daily bleach at 9pm so this gives it time to really churn. Then, 30% speed from 9:45p to 1am. The pump is outside our bedroom window, so this way the pump is quiet while still turning over the water.
Here in AZ, at 1hr per 10 degrees, I'd be running it at 95% for 10 hours a day? Yikes. I haven't seen any algae or CC all summer at the settings above.
I will probably cut back on the daily time as the temp drops.
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Also, it's just nice to have it on low speed when you're in the pool our out on the patio sometimes. When the water is TOTALLY STILL it can be weirdly unsettling. Like it's just waiting to become a cess pool.