Water from well to house runs steady at full blast which seems to say the pump & water supply is great. The set-up at the house is this: water line first comes to a valve where I checked & got full steady stream. Then the 240 pressure switch, which operates normally. Next the pressure gauge which shows pump kicks on at 23 lbs & off at 35 lbs. Next the filter (element replaced last week), then new pressure tank (air shows 27 lbs), then stop valve (open), then line forks for the fairly new water heater, then the rest of the house. With the washer on, water dribbles into the washer. Pump does not come on. Washer fills & starts washing & pump kicks on & gauge shows going from 23 lbs to 35 lbs & holds when pump kicks off. Every thing seems to me to work right so I'm thinkin 1/2" galvo iron pipe installed 1963 has rust blockage. Took part of that line apart couple of years ago & it broke at the threads rather than unscrew. Since the blockage is to the whole house, I think its blocked between the new pressure tank & the fork which goes to the water heater. What do you think?