I am interested in a green one to hold RO effluent water to fill my backyard pond, only if the green one does not cause any trouble for shipping rate (I want to have a colored one for outdoor).
I don't think it is a good idea to use this to hold salt water. I have 3 55G drums to hold RO/DI water and salt water, and the salt water ones always build Calcium in them as time goes. Unless this has an opening for cleanning, it might be a pain to use after a while. Also unless you are placing it at locations without any sunlight like Ian, it is a good idea to get a colored one (my drums are in garage mostly without sunlight, except one that is close to a vent which leaks in a little indirect sunlight, and it grows algae in the drum around the vent).