Mr. Hatton. Well, that is what we call cooking.
Mr. Powell. This is not the same principle of the two tanks where the material is taken into one tank and has a certain bacterial operation, and then passes into another tank, and then finally into beds?
Mr. Hatton. No.
Mr. Powell. You know the system to which I refer; they had it in England in one place, and then started it in Canada, and it was not a success?
Mr. Hatton. That is, they passed from aerating beds——
Mr. Powell. No; they passed first into an inclosed chamber, where the bacteria destroyed it.
Mr. Hatton. I should imagine, from what you say, that must be the process by which both the aerobic and the anaerobic bacteria are the destroyers.
Mr. Powell. Exactly.
Mr. Hatton. We do not want any anaerobic bacteria in our process, because it produces septic action, which is inimical to our process, because it absorbs the oxygen and interferes with the efficiency of the process.
Mr. Powell. Can you take the sludge from the Imhoff tank and use it, or treat it the same as you are treating the sludge there in Milwaukee now?