West Marine seems to have gotten a bunch of Acco chain recently that slipped through quality assurance when it should not have. The galvanization was inconsistent. We went through drum after drum to find the same conditions (the store ended up sending it back to the WM warehouse to return to Acco). The regional warehouse also checked their in-stock drums and found the same poor galvanizing.
It never would have occurred to me to check chain before. Now I won't leave the store, or take delivery if shipped, without running the entire length of chain.