I have a blue one with 2 top holes. No issues with it. I got it from a pool servicing company and it was only ever used for chlorine. The barrels have a fatigue life and can only be sent back for refilling a certain amount of times before the barrel needs to be desposed of. The store owner then sells them off for 20$. I think the biggest thing is to be careful of what it may of had in it before. I wouldn't feel comfortable with one that had car wash soap or oil in it, which seemed to be what most other barrels around here for sale had in them.