What is the name of the process of mixing foam concentrate into the water tank of a pumper to produce the foam solution?

• A. direct proportioning
• B. premixing
• C. batch mixing
• D. prime mixing

Answer: (C)

Mixing foam concentrate into the water in the pump’s tank to form the foam solution is batch mixing. In this approach you prepare a defined amount of concentrate with water in a single batch inside the tank, creating a ready-to-use foam solution that’s ready for discharge. This provides a known dilution, allows the concentrate time to hydrate and blend properly, and keeps the solution contained until it’s used. It differs from direct proportioning, which injects concentrate into the water stream as it’s pumped or sprayed, and from premixing, which combines concentrate and water before loading into the pump system or a separate tank rather than in the pump’s own water tank. Prime mixing isn’t a standard term for this process.