I had a friend from Jacksonville, NC send me two starter kits, as we could not get them in our home town, each kit had 15 filters with them.we could only get about 4 or 5 puffs or less from each filter.The filters lasted about a week.Thinking they had dryed out, i had my friend get us more filters 15 each.The cost of the filters was $64.95. and they don't work any better than the one's that came in the kits .So the replacement fillters cost me over $2.00 each for a product that is not worth a S- - -!! Shirley Jamison 2646 690th RD Gordon Neb.