Mas985 said: Why so high on the RPM levels?...................The rpm levels were programmed by the installer...he works for a very reputable long-established pool company and seems to know his business. Since I had no experience with VS pumps I went along with his suggestion of 7 hours at low rpms and 3 hours of faster rpms. I cut back to 6 hours of low rpm a few days ago and will be monitoring the water quality. My IC-40 chlorine generator is now set at 60% and still producing plenty. I started with it at 100%. As I mentioned I will be keeping a close eye on the pool. I also use a Pool Shark and it works well at the 2750 rpm setting....much slower at the 1750 rpm setting. My pool is a large one (48 feet, 40K gallons) so the Pool Shark has a lot of pebble tec to clean and I'm not sure it can get the job done at the 2000 rpm setting.