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Jim Elbrecht wrote:
On 28 Mar 2006 08:08:25 -0800, wrote:

You can break up a cast iron tub and take it out in pieces.

Just tried this last month.
After about the third whack with my 20lb sledge my wife started
hollering that the cans were falling off the shelves in th epantry
downstairs. I looked at the tub & saw that I had just cracked the
porcelain coating, but the iron was intact.

I grabbed my reciprocating saw-- and a blade appropriately called 'The
Torch' - and 3 blades and 20 minutes later, with no further damage to
the house, I had 2 150lb pieces instead of 1 300 pounder.

I had the same difficulty, but the trick with the sledge is to get the
first crack in the cast iron. Once a crack appears, then the whole
thing starts to crumble pretty quickly. I was not convinced at first
that something that solid, and hard to cause the first crack, would
break up that easily.