You will need an 80 quart pot with a basket with a propane burner, like the ones to deep-fry a turkey or the biggest pot with a basket insert you can find. It's best to do this boiling outside. To clean your crawfish, first hose the whole bag of them down until the water runs pretty clear. Then open the bag and dump the crawfish out into a big ice cooler, with the drain open, and hose them down again. Toss and spray and drain until the water runs clear. Discard any grass, trash, pebbles and dead crawfish you find. Don't keep the crawfish under water too long as they need air to live.