Some Additional Thoughts
Some additional thoughts about these systems:
1) consider the annual maintenance (steps and cost) and (if seasonal) the annual shut-down/start-up steps. Our system adds both cost and complexity, but is worth it, in my opinion.
2) we have just the sediment and UV for whole-house then a small carbon filter on a drinking faucet in the kitchen. I think the carbon filter is essential because it removes the "lakey" taste of the water, especially noticeable in the spring. You might not need a whole-house version of that, especially if the cost of that filter is high.
3) our sediment filter has a weekly backwash cycle that can help with the problem of reduced pressure. Our sediment filter is probably oversized anyway and we never have a pressure problem; it's a tank with a sand-like filter medium, and the backwash prevents channels that can form in the medium which reduce the filter effect.
4) make sure you can continue to get parts/supplies into the distant future. Choose manufacturers that are likely to be around, even if they are more expensive now. I've had to repair a few things and replace the UV bulb every 12-months of use. Fortunately, I have always been able to get the parts.
Good luck!
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