Okay... I think. Correct me if my logic is wrong here. From what I see, the hose at the bottom of the tank "feeds" the hydraulic pump, correct? And that the two steel lines that go into the top of the tank are returns which go through the filter and then return to the tank which should in turn contain clean fluid. Is all of the above correct? If so, ho does one get sediment in the tank and how would it not get into the pump?