The pellets contain Spirulina, Brewer's Yeast, Mushroom Powder and a high level of Calcium amongst the other ingredients and are packed in a resealable 80g foil pouch pack. To use, pellets should be pushed into the soil at a spacing of 2.5cm (1") with new pellets added every 2 weeks or so.. Custodians then feed on the pellet whilst out of sight under the surface. The high level of Calcium ensures that the custodians are a great source of Calcium if consumed.