Ayuh,.... Welcome Aboard,..... I change it when there's a suspected runability issue, or once a year, whichever occurs 1st,....
Never, Ever, dump it out, 'n put it back on, as that allows crap from the dirty side, to get into the clean side,....
Though, if ya got a runability issue, dump it into a clear vessel, to look for water, 'n crap,..... but toss the filter after,....