Don good ?
As it stands now about 18 months is a good rule of thumb.
Having said that you may go much longer, our unit has two gauges, it first measures in incoming water (or street ) pressure or PSI.
The second gauge measure the water pressure after the filters as the water enters the home.
I live in Fernadina, my street pressure is about 70 psi as long as my second gauge is within 15% of that or reading above 60 psi the filters still have time before needing to be changed. Mine is reading just under 70 about 68 psi after one year.
That's a nice feature, you're guessing when to change out because of the gauges. Most other filters don't have them.
Cost -a set of 3 sells for less than $70, I can install them for $25 when needed, so $95
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