There are a few guys who use the 15 inch on this board to prescurb with.. but hardly anyone will use them for encapping residential. If you are encappiung residential most of the time guys are using bonnets so they actually remove some of the soil. I'd suggest if you get one, get the 19 inch. This machien alone with the proper encap product can make you an awful lot of money doing low moisture cleaning for commercial carpet. Its all how you market it. Also the 19 or 15 with soft brushes are great for prescrubbing rugs.