I used one for about two years. I concur with their recommendation of the Luft pumps; I used a lower pressure brand, about 4 PSI as I recall, and the frequent cleaning of the tubing was a real PITA. I think higher pressure pumps would reduce the maintenance. I had each pump (it takes two) on a separate timer, twelve hours apart. I eventually changed to a limewater reactor/peristaltic pump system, and was much more satisfied. I had less hair algae after the changeover.