As usual, Tom is right--the hardness of the water will affect how quickly you will need to put in more resin. Glad to know about Invisible Chamois and will check it out as well.
The On The GoŽ
Mixed Bed Deionizers,
Dual Bed Deionizers, and
Tri-Bed Deionizers manufacturers say 30 washes from the tri-bed ($875 + shipping) and 15 washes from the dual bed ($575 + shipping) and then a 'refill' is a kit that costs $90 each time. Yes, the tri-bed is cheaper and saves time over the long run but it uses an area of 30" wide by 22" high by 10" deep as compared to the dual bed that uses a 10" by 20" compact area. If we can't get it back with the water filter and have to use part of a bay area, we may go with the tri-bed. Of course, a 30' trailer PLUS a 43.5' coach, means we run out even faster...
[I thought it was interesting that Steve sells so many Prevosts but prefers to own a Newell...1992, I think.
Speaking for us (not Steve), some of the really new coaches are so electronically 'out there' that mere mortals like us are challenged to fix them...which might be needed when we are in Montana without a road, much less a soul, in sight.]
Best.
Lynn
Lynn (we're new at this!)
1991 Newell (upgrades by Newell in 2000 and 2008, exterior mostly) 43.5'
2009 30' ATC Stacker