Whole house filter system, 1” vs 3/4”

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DIYrental

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I’m currently replacing the old galvanized water line with Pex. I’m running 1” into the house straight to an Aquasana Rhino whole house filter system. I plan on converting down to 3/4” after the filter then onward to the house, etc. However the filter allows for either 1” or 3/4” inlet and outlet. Any thoughts on whether I should convert to 3/4 before or after? Would 1” give me better pressure/volume through the filter orwould 3/4”? Thanks for any input, hard to find any info on this.
 

Cliffyk

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The flow through the filter (which is itself is a restriction of course) would be further restricted by 'necking down' before the filter; however from a purely practical perspective--and in the overall scheme of things--it really doesn't matter; any difference wiould be barely noticeable.

That said, I'd keep it 1' through the filter unless there is some inescapable problem in doing so...
 
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DIYrental

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Perfect. Thanks! I’m keeping it 1” then downsizing to 3/4” just after, to run it to the rest of the house. Thanks again.
 
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