sustainable garden design perth zincalume is an alloy which won't readily rust unless it has constant moisture. We coat the interior of the tanks with a water sealing paint food grade. This further prevents rust and significantly extends the life of the tanks.

sustainable garden design perth The material used for garden beds is zincalume which is basically the same metal material used in conventional water tanks. At the top there is a layer of rubber to prevent the sharp edge from causing cuts. You should be able to get the same thing manufactured in the US by a standard rainwater tank fabricator. By the way, there is no bottom to the tank to allow drainage.