1) After foam discharge, switch the 3-way valve to flushing mode.
(Flush for at least 1–2 minutes until no foam comes out of the discharge port for cleaning.)
2) After flushing is complete, close the inlet gate valve.
3) Close the foam solution outlet valve.
4) Open all drain valves inside the equipment, discharge any remaining firefighting water, and then close them.
5) Attach a handle to the ratchet shaft of the transformer and turn it 2–3 times to complete the draining.