Help - I have a 2 story house w/ basement. I also have well water. Suddenly the water pressure in the master bathroom has gotten very low. We just replaced the shower head and took out the water pressure valve, that didn't help. We turned the shower on w/o the head on and got a good flow of water we think, it's hard to tell since I didn't do that before the pressure problem. The house is only 3 years old. It doesn't seem to be affecting any other rooms just the master bath shower. Thanks

If you removed the shower head and got a strong stream then that puts the problem in the shower head.
If you think the stream isn't strong enoigh then shut the water off to the shower and remove the cartridge and check the inlet ports for trash or buildup. While the valve's apart turn the water back on for a few seconds and flush out the supplies. Reassemble everything and try it now. Good luck. Tom