Yes you can recycle, there’s two ways that work good for me! First I’ll tell you how I do it! When I harvest a plant I pull the root ball out shake it off! Then I dump the clean unroofed soil on the ground and keep adding to it! Every few months I start mixing it back in with new soil!
Or you could throw the root ball out and just instantly refill your pots with the old and new soil by mixing! As long as your giving your plants a good flush you will be fine! I let the rain flush my used soil out kinda like a compost but I don’t add anything! Good luck 👍🍀