Mechanically driven diaphragm feeders utilize a motor instead of a solenoid to move the diaphragm. Evoqua Advantage offers Pulsafeeder Chem-Tech feeders with fully adjustable output across the entire operating range and a lifetime lubricated drive train. Chem-Tech 100 Series pumps are available with one or two independently controlled heads in a multitude of materials for any application. Chem-Tech Series 200 pumps are heavy duty, single head pumps with TEFC motors.