this post is kinda old but with my dad being in the remodeling business he rips out a lot of cast iron tubs. the only way we get them out is by hitting them with the sledge hammer. if your using a splitting maul like me the hammer side actually works better than the splitting side. we normally get them in 5-7 big pieces. the walls get broken up and carried out by them selves then the floor then the 1,000 or so tiny fragments go in a 5 gallon bucket. I've seen some people get them out of their house whole, but I won't even move them myself with out them being in pieces. screw that.