Hello ! I never used Autopots but a friend of mine did. So you have 2 ways to do it , 1st : you fill your reservoir with water and wait 2 weeks : it's the manufacturer suggestion. 2nd : You do like my friend, put the pot out of the tray , flush it as desired and get it back to the tray ( that method will flush instantanatly your coco medium ). I hope it will help you 😁✌️🏼