I had taken an empty propane tank to Wall-Mart and have been doing so for about 10 years and know where to take them. I went up to exchange it in the garden center (the place were they are kept) and the guy says " you can't take that in the store!" I said"Yeah, I know, that is why I'm standing infront of the exchange cage waiting for somebody to help me." So he takes my tank and says to go in and make my exchange. He lets me know that I can't take the new one in because it is a "Ticking time bomb" , (his words). I said that I was aware of that also. I'm coming back out with my reciept and he has the new tank ready and I show him my reciept and I'm picking up the tank when he says ,"Ok , I can't let you take that into the store." I sighed and shook my head, rolled my eyes and took my tank out to where I parked which was about 50 ft. from the garden department. I relize the guy was doing his job and I can't fault him for that , but the entire transaction took about 10 minutes (which is fine) and the guy couldn't seem to remember what happened 2 minutes ago. It was pretty frustrating to me.OK. I got all the sand out. Thanks and take care.