The cartridge was obviously leaky as soon as I opened the plastic wrapping. Fortunately I was in a position to wash my hands immediately, or I would have been stained for days. So I had to return it, and dealing with Amazon return is no fun. The return process is confusing at best. When I finally got to the part where I could ship via UPS, the program to pull up a list of local stations wasn't working. I will buy it locally from now on. At least then if there are problems I know where to go.