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The new disposable filter should go approximately 9+ months replacement cost around $80 and just throw it out. ÊIF you go past 9 months, we don't have a lot of experience to go on at this time starting in '05, you will begin to see reduced performance on pump 1 because of the reduction of suction. ÊIf you notice reduction of suction take the filter out and judge again. ÊIf you see a big difference, get a new filter.