filters hsg air, water, earth,,, all can be sold back to you in pure form for 19.99 we can't charge for air, but we can make it all dirty until you have to buy a filter. 081005 ... spam sucks email. 081006 ... spoken brain to mouth filters some don't have them ooo faux pas hilarity at times others non so much 090420 what's it to you? who go blather from