I wouldnt chance re-using the pumps or ballast...you dont know what chemicals were in that water, and potentially have gotten into your ballast....just imagine if you had gasoline or oil seep into your pump motors, or ballast and when you go and plug it in, if it works, it will likely catch a fire, and then your home that stood the test of katrina was taken down by a fire that could have been avoided....chalk it up as a loss......
As far as the liverock, I would re-use it....I would do the rock cooking technique, and once thats over with, re use....that way you arent out all that rock...get a few pounds to re-seed, and your good to go...