I have an issue with water pressure (house gets water from a well). I have an inline filter that I change once per month, and its usually quite full of dark grey flaky stuff when I change it. This stuff even caused our last water pump to finally quit. I noticed that the second floor is very slow, but its not always. Its both hot and cold. Here are the symptoms. So let's say I make sure that I am only running water from the washing machine (upstairs); no other faucets turned on or anything, so the washing machine is getting max pressure. What happens is the water pressure will be very strong when I first turn it on, but then it will die down, and sometimes almost turn to a dribble. What I think is that there might be some sediment in lines that takes a while to flow into the region that will cause the flow to drop. The piping that goes to the upstairs was replaced AFTER the water filter was installed. We also added a disconnect to backflow the two pipes and try to clear out any clog, but the water came gushing out as if there was no obstruction at all. So what could be the cause for this pressure drop? If its the sediment, how can I prevent build-up from occurring? I know pressure will drop with height, but I doubt that's the issue because when I disconnect the pipes the pressure is very strong. HELP!