Just refilled with fresh this spring Alvin. I change out mine at least once a year when the distributors start to stock it. I try to keep 10 gallons of it in reserve and if I'm doing a bunch of cleaning I'll change it a couple of times a year. I've found that the filters most of the cleaning tanks come with are more pain in the ars than just refilling with fresh when it gets dirty.
Denny Graham
Sandwich, IL
