What equipment and features (if any) do you have on your poo? Updating your signature would be ideal. If you have no SWG, then a low rpm of about 600 might be fine. If you have a SWG, you may need an rpm around 1300 or so to keep the flow switch engaged. Once a day you might program it to about 3,000 rpm for a few minutes each day to purge any air in the system and/or add chemicals.