R31 Series paddle aerator attachments from Brown Bear Corporation can be used for sludge drying and aeration of compost windrows. They attach to high-flow skid-steers and compact track loaders. The aerator attachment can be used with flows of up to 50 gpm and pressures up to 5,500 psi, creating up to 95 hydraulic hp that can be transmitted to the aerator rotor. It is available with or without the universal skid-steer hitch and in either 8- or 10-inch widths. The 31-inch-diameter aerator exposes 100 percent of the material to oxygen so noxious odors are minimized. Pad space can be conserved since the aerator can stack windrows adjacent to one another. Drive to the aerator rotor is through the high-flow hydraulic system of the carrier. Changing from the bucket to the aerator takes a matter of minutes and eliminates the need for separate machines. 641/322-4220; www.brownbearcorp.com.