Yes, Biobizz soils can be reused, unless they have been in continuous use for more than 6-9 months. Here is how to do it: 1. Remove and discard the top surface layer of soil from the plant pot or bed.  2. Gently remove the old roots as much as possible. 3. If you have All-Mix: add fresh Pre-Mix (5%) and Worm-Humus (10%), then moisten. If you use a pot, leave it in a warm place for at least one week. - If you use Light-Mix: simply add 30% of fresh Light-Mix to what is already there.