The difficulty is getting the customer to appreciate the difference. We make this clear by putting a few ounces of dish soap on the flapper, then flush and watch as the commode drains must better. The soap lubricates the jets, but after it's all gone, the commode is once again a poor flusher.
I have sold many commodes using this technique without wasting any time auguring the unit first. All of our customers love the trick and completely understand the concept. Mike Roberts ABC Plumbing & Rooter Co. Inc. Chandler, Ariz.