Guano is to most people bat droppings, in this case it refers to fossilised seabird droppings. It is an Australian Certified Organic product from NTS, repackaged from bulk by SCRAP for home garden use. Coverage is around 10m2.
It contains around 13% soluble phosphate, 36% silicon, 31% calcium + iron, potassium, zinc and various trace elements. Try it on your garden and witness the benefits of this excellent natural fertiliser.
Safety: do not allow the fine particles to be breathed in and avoid contact with skin and eyes.