Hi, this is the first time at this site-not sure how I found it-I'm hoping someone can help me! I have been trying to get someone to service my GE autotrol whole house system. The conmpany that installed it went out of business. They were supposed to check media and unit twice a year. I don't know exactly what media was put in my unit- the original big problem was a ph of 4.6! There were other issues too....iron, smell, hardness, to name a few. The unit is at our lake house with well water and this is our 3rd summer there. The media has never been replenished. Our house is on Lake Gaston, on the VA/NC border. Any help is greatly appreciated!