I have very low water pressure only in the back of my house which incororates the master bath and kitchen. There is ample pressure to the rest of the house.
Can anyone help with this?

The first thing I would do is shut the water off and start opening up faucets and checking the cartridge inletports for trash or blockage. Before you reassemble turn the water back on to flush out the supplies and the open valve body. You should have a strong stream coming out of the open valve body when you8 do this. Now move on to the next one and do the same thing. If you don't have a strong stream click on back. Good luck, Tom