Hard Water Shower not used for a while now no hot water
Please help... We have guests that are going to be using the shower that has not been used for several months. Now that we want to use it the hot water is not coming out. I heard it is due to hard water in our area. I have taken off the fosset handle that directs the hot and cold water. There was a white plastic cartridge that I took off. A lot of debris came out. Now what do I do? Is there something else to clean out to make the hot water work? I am looking at a steam like metal piece that comes out of the pipe that turns left and right for the water... Thanks