.Like the autopot, the tray fills until the valve stops it but then the mat absorbs it. Pot sitting on mat then absorbs that. I like it because the entire bottom of pot is wicking, as opposed to the autopot which uses an airbase with holes for wicking. The pot is actually submerged in water while using an autopot so you need the one inch high airbase to keep substrate just above water. With the tray I don’t need an air base, an air dome, or the air pump and the pot is easy to remove from the tent. This is an air base and you can see the holes for wicking
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So the basic answer @KingRatt is that the pot is submerged an inch in water when using the pots so a mat is useless.
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