I am trying to fix my existing water softening system, or understand if it needs to be replaced. The system was installed in my house by some previous owner. I have no documentation on the system.
There are two mineral tanks in series. The first has a Autotrol 460i controller (digital) and the tank is smaller. The second tank has a mechanical controller (not digital, I can't read the model number, I can provide a picture if needed) and is significantly larger (perhaps twice the size of the first tank). The second tank has a bypass valve that is set to "service" mode. Both mineral tanks are connected to the same brine tank via plastic tubing with a T fitting.
Could there be a good reason why this system was set up like this, with two separate controllers? I can get the smaller tank with digital controller to do a manual regeneration, but I can't get the mechanical controller (big tank) to do anything. The system has been sitting for a long time and does not regenerate (or work at all). Should I scrap the whole mess and start over, should I try to fix and keep all or part of the existing system?