Water softener timer or 'on demand' for well water?
 

I'm building a new house and it'll have a well. The hardness is
moderate to high, and there's a moderate amount of clear iron. The
water softener the GC recommends is a large unit to handle the iron,
but he recommends a clock timer system regenerating every six days or
so. I've always used 'on demnd' systems in the past with city water.

The GC says that with the higher iron content it's better to
regenerate on a regular schedule to 'flush out the iron' and the resin
bed will last longer. He say's that with an 'on demand' unit there's
more risk of iron lingering in the resin.

Sounds like 'B' as in 'B' and 'S' as in 'S', and I'll just use more
salt.

Any opinions?