I am attempting to improve the water quality for my kids / ex wife. Currently their house is using well water. The shower heads and tubs have developed a reddish brown stain. The water pressure in the house is sad. I have ordered a water softner for the whole house and an undersink RO system for the kitchen sink.

The actual point to this post is a question. I am fairly certain there is a build up of nastiness within the pipes of the house. Can these pipes be cleaned or do they need to be replaced?