I have a 2 year old new home. I discovered 1 year ago that my spare bathroom, which never gets used, did not have any cold water in the shower. The water works great in the rest of the house. I took apart the faucet (pioneer) but could not find any clogs. A plumber came out was here for 15 min and had it working again. Unfortunantely I was not here so did not see the repair. A couple of months went by and it happened again. The water is very hard here's as I am in a rural community. Once again I took it apart tried to clean it out, put it back together and it started working again. It has happened again and once again I think it is hard water build up. Is there any trick to try and flush out the pipe.