Of course I mean well, as do you. However, you are wrong about capacity. The brine tank in the Nova system is at least twice the size it needs to be. There is minimal, if any, difference in the quantity of water delivered to the inside of the house whether it is run through a 10" filter or a 20" filter. This is easily confirmed by having pressure gauges both before and after the filter system.
The only advantage in using 20" filters vs. 10" ones, is that the filters will not need to be replaced as often, i.e. a 20" filter will last twice as long as a 10" filter. We have 20" filters which I used to change once/year. However, for two years running, the sediment filter was nearly pure white in color and did not need to be changed. From now on, I will wait two years before changing it. The reason that I recommend 10" filters is that changing a 20" filter is a PIA(pain in the ---).
As to the water softener, the only difference between a large exchange tank such as sold by Nova and a smaller tank used in the "all in one" softeners I recommend is the frequency with which the matrix (plastic beads) in the exchange tank is "washed" by the salty water from the brine tank. That frequency is adjusted by the controller which is, essentially, a clock. There is no discernible difference in the quantity of water sent to the inside of the house from a softener with a large exchange tank vs. a small tank. If your household uses an enormous quantity of water, the matrix in the exchange tank will have to be "flushed" more often then with a large tank.
Home Depot sells a Rheem 32K grain softener for $399, which is plenty for a Villages household of 2 people. If you want the Rheem 42K grain model it is $499. HD sells the iSpring 10" two stage filter set (one sediment, one activated charcoal) for $150. Estimated time for installation is 2 hours.
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