Medallion Plus® Sump Cleaner is recommended for use at concentrations of 2% - 6%, depending on the amount of soil present and the application pressure. A circulating time of 1 hour is generally sufficient for most coolant systems, although longer contact times can be used for particularly difficult cleanouts. Rinsing is not required before adding the new coolant unless a large amount of the cleaner remains in the system. In this event, a light flush is generally sufficient to complete the cleanout. Special engineering considerations may apply for high-pressure systems. Please consult your PetroLiance sales representative for technical advice.