I can't remember the last time I bought filters. Probably 10 years. Hot hot water and let dry thoughly and you shouldn't have a problem. Even my prefilters are more than 4 years old.
2012: Probably 750 gravity taps and 50 buckets.
600 gal stainless milk tank.
2 - 100 gallon stock tanks
one 30 gal barrel
50 buckets
3' x 10' Waterloo Raised Flue wood fired evaporator w/ open pans.
12" x 20" Filter Canner
Sawmill next to sugarhouse solves my sugarwood problem
Gather with GMC 3500 2wd Pickup w/ 425 gallon Plastic Tank.
Been tapping here in Lyman NH since 1989 but I've been sugaring since 8 years old in 1968.