On Mon, 12 Oct 2009 20:01:40 -0600, "SteveB"
wrote:

I was taking a shower, when the water started a chattering noise, and the
spray was a pulsed spray. This came on when the Moen twist dial was in the
same position for about two minutes. I changed the dial, then returned it
to the original temperature position, and it did it again. A little
adjustment of the dial makes it go away, but it returns. What's this?

Steve


The overall water pressure in your house has increased. The chatter is
the anti-scald device trying to deal with too much pressure.

You need to install a water pressure regulator and set it at around 50
psi. The easiest way to check and adjust the pressure is to buy a
water pressure gauge that has a standard garden hose fitting on it.
You can buy these ready made for about $15. Screw it on to any hose
bib to use it.