Perhaps in some parts of the world companies such as Brita and Pur will take back used water filter cartridges, but I don't know where to do that in LA, and even if they do, why waste money, gas or packaging to get it back in their hands when you can just refill the purifying agent inside? Especially when those cartridges are most likely not being reused you will continue to buy expensive filters made of virgin plastic. **If you are not hip to the myths of recycling, see my handy link "Recycling: The Problem of Chasing Arrows" under the list on the right-hand bar. After reading, if you click here , it will take to you to a misinformed blog post where I found the photo below. LA residents comment below about why the post is misinformed and win my first GIVEAWAY: 2 cups of activated charcoal in your own container, Enough for 4 filter cartidges, up to $18 value!! "NOT I," SAID THE ECO-CAT! I ordered a few pounds of activated charcoal and followed these instruct