How often should I change the standard throw-away 1” filter?

 You should change the standard 1” filter every 6-8 weeks.  Believe it or not, a filter

actually becomes more efficient as it gets dirtier…up to a point.  After peak efficiency

is reached, the efficiency drops again.  Make sure to inspect the filter and use your

own judgement.  Don’t let the filter get “clogged” as this can cut down on the efficiency

and/or cause damage to the unit.