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Old 12-27-2012, 12:42 PM
laman laman is offline
LawnSite Senior Member
 
Join Date: Jun 2009
Location: Louisiana
Posts: 278
I change my inner filter when it is not white anymore. It starts looking kind of a light grey color. It takes a while before this happens. I usually change the outer filter year and a half to two years all depends on how dusty it is.
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