In the last few months I have noticed a not very loud but noticeable sort of stuttering or squeaking sounds coming from our water pipes after water is turned off from a faucet or after a toilet is flushed. After reading online a bit it seemed as if we might have a little water pressure buildup up. So i turned off the main water and drained water from the lines. Noticed that in the rear bathroom of our one level house that it gurgled a little more than any of the other faucets when the faucets were flushed and had just a little gray sediment come out after turned back on. After draining the lines the sound returns to normal for about two days and then the sound would return at first when hot water is run and then slowly when both hot or cold is run. One thing to note is that we had our water pressure regulator replaced about a year ago and water pressure is good at 60lbs. i have turned to this forum for advice so that I dont have to repeat this process over every few days. Any advice is appreciated.