I'm a dummy homeowner and would appreciate some help identifying the setup in the picture at http://img585.imageshack.us/img585/9899/p1010016fr.jpg and answer some questions about future repair or replacement. I believe that the tanks are 9x48 with autotrol 155s. Water source is a well in Florida. They are around 20 years old and still seem to work without any maint except I put a new timer and some valve plungers on one. I think the tank next to salt container is for iron and based on what I have read probably has green sand in it because I add potassium permanganate (not as often as I should) to the small round tank between the two units. A service tech told me I need new resin but the water is not hard to me. I will get it tested as I sensed the tech was a ripoff artist (more to this story) - 2 people live in house. How often should iron unit regenerate? Should it run before or after salt regen? - Does the resin slowly degrade and ultimately just not soften the water at all. Or is it something that either works or doesn't work? - Does green said wear out? - Do the tanks last forever? - Assuming that at some point in time, I will have problems with the autotrols and 20+ years on the resin and greensand, would it make more sense to buy a new setup or just repair and re-bed as needed ? - Are all bypass valves standard dimensions - meaning will existing plumbing attach to bypass valves regardless of mfg (autrol, fleck, etc) - Is there a one-tank solution for both iron and softening or are two tanks necessary with iron in well water? thanks in advance for any help.