I am I having issues with my Tunze 5017 and can?t find any solutions online. The pump used to have a strong pressure and a steady stream coming from the outlet hose but recently it only drips at a very slow rate. This causes the pump to be on more frequently and sounds very annoying. I have removed the pump and cleaned it in vinegar with the same proble. I read the manual for 5017 and it shows a dial inside the control that can adjust the flow rate but mine doesn?t have it. Anyone run into this issue ? What do you think the problem is?