Gary Slusser
That's all folks!
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The cuft volume of resin required is based on the constant SFR gpm of the softener that is needed to cover the peak demand flow rate gpm of the water system the softener is installed on.I think of all the resin (4 cubic foot as compared to 2 cubid foot) as being "used" because it is being "used" to get more salt salt efficiency and because it is being used to achieve lower leakage. The way I think about it the fact that with 4 cubic foot of resin that the unit is not set up to regenerate 120,000 grains at each regeneration is just a result of "using" the 4 cubic foot to achieve greater salt efficiency.
Correct.I agree that hardness typically varies. A system should be designed for the maximum hardnes seen to achieve consistently soft water. If the system is not so designed then the customer will almost certainly deplete the resin at some point and need to do the back to back max salt dose regenerations. But I see this as applying whether there is 2 cubic foot of resin or 4 cubic foot of resin.
p.s. Bob he is not going to get it no matter how much it is explained to him.