williaty Posted July 10, 2014 Report Share Posted July 10, 2014 I'm running the Wynn upgraded replacement filters in two of my Jet ambient air filter units. It's pretty obvious when to change the Purolator pre-filter. When it gets shaggy and I can't see the metal webbing anymore, the filter gets changed. What about the internal multi-bag filter though? It never seems to look any different but it must pack up at some point. How do I know when to change it? Quote Link to comment Share on other sites More sharing options...
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