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What circumstances would have to exist to change it?
Tony- If you spa is like mine ('03 Optima) in addition to your main filtering cycles, we also have the small circ. pump running 24 X 7 thru the microfilter. That may reduce the need to run the main pumps.My water stays clear on whatever the factory default setting for the main pump is.
My factory settings are 7-9 am and 4-6 pm with a 10 am cycle/purge (30 seconds)of everything. Two months in now and everything is looking good.
What tub do you have that lets you set specific times? This is a feature I didn't consider when I was buying, but sounds nice.
I like that feature. Sundance recommends boosting up the filtering that the main pump does when the temperature nears -30F. Four filter cycles per day, can go 24 X7 if we want/need. Plus the flexibility of the circ. pump.