Did you add the circ pump option when you purchased your spa? If not pump #1 will kick in on low speed for the duration of the filter cycle...of course you have 2 filter cycles (filter 1 and filter 2). Everyone has a different opinion on the length but most agree the average total amount of filtration per day should be 6-8 hours roughly so each cycle should be set for 3-4 hours each. If you added the circ pump the water will move up to 24 hours per day.