Pour equal amounts of water into each filter. All soil comes from the same basic recipe, however, amounts of the different ingredients can vary widely from one place to another. The main components of soil are the minerals. The minerals are made up of clay, sand, silt, gravel, and stones. The next ingredients in soil are water and air.
Organic material is the last component.
This is made up of dead plant and animal matter such a leaf litter, along with billions of living organisms that you cannot see such as bacteria and nematodes.