[Dorothee Jöllenbeck-Pfeffel]

Hi Bill!
Seramis is made in Germany from 100% burned red clay. They have told me that the indoor stuff would not contain any additional fertilizer. Calium would be contained naturally in clay …. Normaly you use that stuff instead of soil for plants. A kind a f hydro cultivation…..
If you have the possibility to get clay and a place where they burn it for you , you could use such kitchen tools to press noodles through or cooked potatoes to get clay worms and cut the clay worms afterwards in small pieces. Than you have o burn the pieces at about 950 degrees Celsius.