This is for customers who want to use our wonderful worm castings who are on a tighter budget This is a blend of our original ( and best worm castings ) and our fine sieved composted bark that has been used within our wormery, alive with wonderful microbiology, all Peat & Chemical free This is different from our flagship range because it has been sieved and processed to 5mm ( Our flagship range is sieved to 2mm )