That's another problem out here - plumbers.
I have never in my life seen a group of guys less motivated to work. They're all in business for themselves, but they're all lazier than hell. Don't return calls, hell they don't even bother to answer the freakin' phone!
You definitely have a point, Trav. We are going to be in this house a maximum of 10 years. Replacing 3 of those units at $400 equals $1,200, plus $700 for the freakin' plumber (if you can find one that is alive), and hell, it makes no sense to plunk down a lot of money for super-clean water.
We're just looking for something that's going to clean some of the sediment out (there is some, since it comes from a reservoir) and maybe soften it a little. We don't need no stinkin' RO water.