You posted that you have cartos that have lasted weeks, I can only get mine to last a couple days. I usually switch back and forth between TV Peach Melba and Geoff's blend (which trashes my cartos but I don't care cuz it's yummy!) usually 2-3 days and they are stale and burnt tasting, i've tried boiling and letting them dry, but they are still gross, or will maybe last 1 day. I don't really mind buying new ones, it's not a huge deal, but if I can save a couple extra bucks, then that means more juice for me