The direct-drive VF-100 dry chemical/polymer feeder from Eagle Microsystems offers feed rates from 0.05 to 50 cubic feet per hour. Rates are controlled by an electronic SCR speed control. The unit is constructed from 304 stainless steel for corrosion resistance and long life in harsh chemical feed environments. The maintenance-free feeder requires no lubrication. 610/323-2250; www.eaglemicrosystems.com.