On Jun 18, 5:57*am, "Steve B" wrote:
I was cleaning one of my vacation rentals. *I turned on the MOEN shower
water control. *In the middle range, where the warm water would be, there
came a pulsing sound that sounded very regular and harmonic. *If you turned
it to hotter or colder, it went away, but if you approached middle again, it
would start, and make an audible sound whoomp whoomp whoomp. *The water also
varied in strength, and spurted slightly with the harmonic waves.

Any ideas of what is causing this or how to cure it? *Install water hammers?

Steve

There may be air in the system. Or, you may need to dissemle the unit
& clean all the parts.