Can a rusty storage water drum dammage my soil?

 

A few weeks ago I bought a steel drum, the inside is a little rusty, when I fill it up the water turns a little cloudy, the drum held pineapple juice(the website states this and the drum has a large label on the side also stating this), I've since cleaned it out thoroughly. I've been using it for a few weeks on my plants and nothing seems to be disliking it but I'm a little worried about soil chemistry, can a rusty barrel damage my garden plants and soil?