And I still have no proof of your claim that there is a limit of the gallons of discharge etc. in those links, there isn't in the first link. So find, identify and copy/paste one instance where they limit the volume of discharge from a softener as opposed to outright banning them or allowing them.
You make the claim of no tools, not me. So show or tell us in detail how to replace the seals and spacers in a Fleck 5600 or 2510 without the special tools and I'll be corrected. Remember you can't get two fingers into the hole in the valve body to be able to grip a spacer.
Gary Slusser Quality Water Associates