During the last week, my water flow rate on my trolley has dropped, and now I am just getting a dribble on a rate of 35. Also the pump is vibrating and making a shuddering noise. I have contacted Pure Freedom, and they said it was because I am using pole hose. Today I tried out my pole hose on my son's van system and it worked fine. Someone said I have dirt in the diaphragm, and to take it off and clean it. This is easier said than done. Anyone else had this problem, and how did you cure it ?