Did I say ANYTHING at all about the 5600 valve? Ahhhhhh NO, I did not so quit twisting and inferring things. Just because YOU think that you are the only one in the whole world that knows how to size a softener does not make it so. Again, I've been at this a whole lot longer than you have and my results thus far have been spot on. As for the 7000 and SFR, how about YOU do some reading and tell us why I recommended it because you apparently have little experience yourself in correctly figuring SFR. You should quit while you're behind. With every post you are making yourself look worse and worse.