http://www.alliedclearwater.com/
We had multiple tanks, radon, arsenic, salt, osmosis and iron remover for a decade. A&B charged us $600 for annual maintenance. In the past year numerous calls to A&B for leaks etc. Big bucks! I saw Clearwater at a business expo, and they claim I don't need all those stuff!
Now I have a radon and arsenic removal. I had the water double check by UNH as a precaution. The other devices were not needed and I was spending tons of money for nothing. For second opinion give Clearwater a call!