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The ability of a growing media to take up water effectively once it has dried out is critical to the growth of plants and the ability of the media to become wet again. This is known as wettability. Testing for wettability isn't difficult and can be done at minimal cost with some basic equipment and a little bit of time. This video shows a process for carrying out a practical on-site wettability test on growing media.

youtu.be/fO5TE_RV2Y0