What is an agent tray?
I saw another dishwashing person recommend that you run your kitchen sink tap water until it's hot. I do the same with mine, because I have a gas water heater which is more efficient than the DW heater they have built in to the machine. See, I know how to save energy...and can do a better job than nimrod regulators. I also run the tap water for my washing machine in the laundry room for the same reason, since my Bosch washing machine can super heat the water for loads.