You're all gonna hate me 
But I got one of those EcoWater (GE rebranded) water softeners at Home Depot. No timers. No calculations.
Just set my hardness setting, and added a bit for iron in the water.
It's worked great. Honestly. And I know where to find replacement parts.
It sounds like GE Repair won't even touch these, which is unbelievable.
But yeah my water is really soft now. No weird salty taste. It's easy on salt on the "saver" setting. Only regenerates on demand, which so far is only every 2-3 weeks! (It's just me).
It does seem to be keeping the iron under control. Very minimal red/pink staining thus far.

But I got one of those EcoWater (GE rebranded) water softeners at Home Depot. No timers. No calculations.
Just set my hardness setting, and added a bit for iron in the water.
It's worked great. Honestly. And I know where to find replacement parts.
It sounds like GE Repair won't even touch these, which is unbelievable.
But yeah my water is really soft now. No weird salty taste. It's easy on salt on the "saver" setting. Only regenerates on demand, which so far is only every 2-3 weeks! (It's just me).
It does seem to be keeping the iron under control. Very minimal red/pink staining thus far.