I'm trying to clean up a bit after rearranging and found 4 bottles sitting in the closet. They're empty and the only thing I 'may' use them for is the pumps if we ever had a pump game. But if they'll work on CA and the field is using less CO2, is there something I can do with 'em? Donate, sell, recycle? I've no idea when they were last tested but I don't see a reason why they wouldn't pass.

melt them down for some $$$

Ok, I'll bring 'em to the field and toss 'em in the fire. That might be an interesting way to spend an hour. Make sure everyone has a mask though.