If you have the proper flow rates listed rates and proper float switch bracket installed, you may need to modify the Clarisea's input pipe as the inlet vents can restrict the flow into the clarisea. The slots in the input tube may be too small and need to be opened up to allow more flow into the clarisea. These slots also can build up with bio slime or algae over time and cause the SK5000 not to function properly. This needs to be done at your own risk as we are not responsible for any parts on your clariseas. Please see the photo below: