A volume of distilled water is applied in a circular motion to the substrate surface of each container or individual cells of multiple plant trays.

Volume applied varies with container or cell size, but the objective is to obtain about 2 ounces or 50 milliliters of liquid (leachate) exiting individual containers or collectively from about four cells of the multiple plant trays.

A table of approximate volumes applied is available in the interpretation portion of this module. If insufficient leachate is obtained, then select replacement containers and apply an increased volume of water.