I've been running mine for about 5 years with original filters. Finally changed them yesterday. 1 st vertical is sediment, middle is carbon chunks, 3rd is carbon block. First horizontal above the verticals is the membrane, then DI then polishing. If you backwash you unit regularly then the membrane is probably still ok, so don't bother changing it, just change the rest of them. My TDS went from 83 pre change to 2 post change, hopefully it makes a difference in the tanks. Less GHA.
HTH
Brad
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