I have to replace my inner filters once or twice a season. For some reason they disintegrate before they get dirty enough to need replaced. I blow out the outer filters as needed, daily for the first couple weeks in the spring and the last couple months in the fall, and about once a week or twice a month during the growing season. I typically replace the outer filters once a season, unless I have to replace the inner filter, at which time I will do both at once.
Kansas Certified 3b Applicator
223 52" Grasshopper
48" MTGHS Walker EFI High Dump
32" Toro T-Bar
PJ 16' Trailer PJ 12' Trailer
2010 Kawasaki Brute Force 650 with Warn snow plow
2000 Ford F250 with aluminum dump bed