The Picote wire brush range is a safe option for smaller-diameter PVC pipes. They are designed specifically for lightly removing any buildup of scale. Used with the Micro or Mini Miller machines, they come in pipe diameters of 2, 3, 4 and 6 inches. There are additional brushes for the Maxi Miller machine in pipe diameters 4, 6, 8 and 10 inches. 219/440-1404; www.picotesolutions.com.