I'm building a new house on a slab. I laid all the drain pipes and called the inspector. He said they had to be pressure tested. He said to stick a 10 ft piece of pipe verticle to pressure test it. He didn't elaborate on it and left before I got a chance to talk to him myself. I was going to use an aircompressor to pressure test it but the 10ft pipe thing has me confused. And of course he hasn't returned my call. The only thing I can think of is to add the piece of pipe and fill it all with water. Would the extra 10ft of pipe add enough pressure to find any leaks?? Thanks