ENVIRA® E-604 is a dry cationic polymer and is acrylamide based. This product designed for retention aid in paper making and is effective over a wide pH range. It can be applied as is or combined with a coagulant during application. ENVIRA® E-604 provides superior fine and filler retention while simultaneously improving drainage and cake formation. It has proven to be excellent in dewatering and thickening sludge.