Don't know which filter you have, but am assuming you are referring to the in-line filter that is in the line to the kitchen sink. My filter specifically says it is good for one camping season. The fact that it filters out all that stuff you don't want in your water means all that stuff is still inside the filter. Therefore, I always discard the old filter at the end of the season, and buy a new one for next year. If there is any bacteria in there, it will likely grow with moisture, and why would you want that dirty filter to start you off next spring ? JMHO
2003 Ford F-350 V-10 Crew Cab 4WD Long Bed
2004 Jayco Designer Medallion 29 RLTS 5th wheel
Bill, Gayle, and Mindi (dachshund)
Retired at last !
Nothing is foolproof to a sufficiently talented fool.