I have recently purchased a new pump for my fountains. I noticed when reading through the pamphlet that it says repeated cycling on/off will shorten the life span of the pump. I have always set the timer to turn the pump off for nighttime, as there is no need for the fountains to keep running overnight. Does anyone know about this recommendation for continuous operation? Btw--I do not have any fish in this pond, nor does it get cold enough for the water to freeze.