[Resolved] For Autopot, when using Sohum Living Soils, is perlite used. What ratio, if so? To Parent Forum September 8, 2019 at 5:33 pm #237 HereParticipant For Autopot, when using Sohum Living Soils, is perlite used. What ratio, if so? September 8, 2019 at 5:33 pm #239 JoshKeymaster There is no need to add additional perlite, Sohum soil also needs to be used in a pot with a minimum size of 20ltr or the volume will not be great enough to supply the food for the duration of the plants life. You must be logged in to reply to this topic.