I am not finding anything good online, but it appears when you buy a $1k + whole house resin tank filter (not a softener) that its basically all the same hardware, however the media bed or resin bed is different. I have an old 9" resin tank from a broken water softener, and was able to dump the old junk media out of it. I would like to put in all new media, and put a new upper control on it, and use it for a whole house filter. Any ideas how I should do this?