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For those of you considering using metal containers for underground storage there are several things that can be done to add years of lifespan to your containers. First.... bury in a location with good drainage. Second....IF drainage is questionable the hole your container goes into can be enlarged and gravel can be put below and around it. Also place a cover over the top before burying....something as simple as a heavyduty trash bag over the top to keep water from pooling on the top. Third.... coating your metal container with tar is a good idea. Fourth.... add a sacrificial anode to your container. It corrodes rather than the container. Sacrificial Zinc Anode
Coating steel in roofing tar will add many years to their usefulness