10ltr Refill = 2 x 800g. 5ltr Refill = 800g. The Birdfood Warehouse Dried Calci Worms. Calcium is one of the most important minerals required by the body, Calci-Worms have an exceptionally high level of Calcium compared to other dried insects, Calci-Worms have a Calcium to Phosphorus ratio of 1.52:1.