Micro-Quest L (AFCO 4420) is a liquid additive component used with Micro-Zyme L (AFCO 4415) in the CIP cleaning of Reverse Osmosis, Ultra Osmosis and Nanofiltration membrane systems. Its buffering agents will enable optimum enzyme function and performance. AFCO 4420 also contains soil dispersing and suspending agents and mineral conditioning agents. USDA authorized.