Thank you Gary! So you are suggesting a 4.0 or 4.5 cu ft softener correct? What are your thoughts on the 2510 fleck valve? Heard good things about it but not sure if it has the variable reserve feature or not. Also, in 5 years we will be down to 5 people in the house and I also plan on putting on a bypass valve so any outside water usage will not be going thru the softener. (My old/current softener does not have a bypass) We do water the yard, kids use the sprinkler, wash cars, etc. In 10 years, down to 3 people. Knowing that, would you still recommend that size? Also, if you did purchase a the bigger unit and water consumption drops like it will, can you program these bigger units to still be efficient? I realize regenerations will be less frequent but is that a concern I should have? Would it still be economical rather than having to downsize in the future? Also, one guy told me they set their softeners to 10#lbs and not 6#lbs. He said it cleans the resin bed better or something like that. Is there any validity in that and why is that such a big deal or isn't it?