Wife said she noticed it was wet around the base of my 30 gallon liquid chlorine drum. I know I had 15-20 gallon in it. Just got back in town and now the barrel is empty. I unhooked it and see a small hole in the bottom. Barrel only 3 years old. Anyone else have to replace theirs? How long should it last? It is a Greif. it sits on my pool pump slab. There is some small sand/abrasive feel on top of slab. Maybe small movements when I shake it to see how much is in it wore the hole. Not sure.