A few months back, we replaced the pressure tank in our mobile home. Since then, I have noticed that the water flow "surges" with the pumping of the pressure tank rather than being a nice, constant pressure. Shortly after the tank was replaced, I also notice some debris in our water. It appeared to be sand. We also have intermittent loss of water flow to fixtures. Sometimes it is just certain fixtures, sometimes all. It seems to occur the most when we use the washing machine which is located next to the pressure tank. Wondering if debris was dislodged when we replaced the tank and has clogged a line somewhere. Any ideas and advice would be greatly appreciated!

The surging pressure would seem to indicate that the pressure tank's precharge was incorrect for you pressure switch. Shut down the pump and drain off all pressure and use a bike gauge to test the air pressure and check the pressure switch for the on/off pressures. It is also possible that there is a more serious problem if you aren't getting water and are getting sand in the system.