I don't know why the SAKs have aluminum in them at all but, I'm guessing it might have something to do with how dialysate in a SAK comes in a large plastic-type bag with many folds in it and is mixed with tap water in the Pureflow machine for 7-7.50 hours and the fact that the SAKs hold over 30 liters of fluid, compared to bags, which are much smaller and hold only 5 liters. Maybe the law requires anything over 5 liters to include aluminum in it for public safety reasons (to guard against bacteria ), like city tap water is. I don't know...but what I DO know, is that my husband gets up at the crack of dawn every morning and feels up to working a fulltime semi-physical job and despite having an aluminum level of 15, he feels better now than before he started dialysis and his labs keep looking better and better each month. Go figure. His neph says he is an "exemplary patient". He doesn't want to hang bags and I can't and being in a small apartment, we also do not have the room for bags. At least not on any regular basis. He said if he had to, he'd go back to doing in-center and pray that his boss could accommodate such a schedule if he couldn't get in at a center that does extended hours beyond 5pm. Meanwhile, the chances of our being mugged or shot by thugs in the neighborhood seem quite high. There is nothing quite like being on a morning walk with your dog when suddenly and seemingly out of nowhere, thugs run past you and there are cops in every direction, including a helicopter overhead, with you and your dog standing literally in the middle of it all. It's a dark world, folks and having to fear aluminum ain't helping. To make matters worse (and I'm being serious), I just read all the ingredients, contraindications and warnings that come with my asthma inhaler and come to find out, if asthma doesn't kill me the inhaler just might.