About a year ago, I installed a Delta faucet. It had a sprayer with it. Never had one before. When I got everything installed, i noticed a high pitched whine. I guessed it might be trapped air somewhere. I took the sprayer and spayed it for 15 seconds or so and the whining stopped. I contacted Delta and they sent a new valve and diverter. That did not stop the whining. Since then, I have spoken with friends who have sprayers and they complain of the same issue....WHAT is the cure for this trapped air (when using sprayers?)

Marc

I've never experienced this, and have always had sprayers. Maybe the pressure, or volume, is too much, and causing the sound? What happens if you partially close the valves under the sink to reduce the volume? That's where I would start.

Open the faucet and start the water spraying, to where the noise to happening. Then under the cabinet, start to slowly close the hot and cold valves and see if there's a point where the noise stops.

I"m speculating that your aggressive waters with deposits are adding new tolerances to the inside of your faucet, causing resistance and noises.

Best Wishes