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I am installing a whole house filter and UV system. The connections are all 1 inch. My incoming main (city) is also 1 inch, but has been reduced to 3/4 pex (feeding a softener). I plan to put the filter before the softener, so should I run 1 inch (vs 3/4) from the main, into the filter/UV system and then reduce to 3/4 for the softener? Or is keeping the whole setup at 3/4 ok? I’m thinking I should run 1 inch all the way to softener because I can and because I will have slower velocity which I am learning is better for filtration/UV. Am I correct?

Randall
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I would put the filter at the softner and do the reduction there. I would suspect you have line(s) feeding outside faucets that should be connected before the filter. I do not know what filter you have so I will also suggest adding shut off valves both in front and behind the filter so you can isolate it when it is time to change/clean the filter element.

Gil
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