For decades, we sourced our Silica from US Silica's Illinois Plant.  As their prices skyrocketed, we inquired with other clay manufacturers and suppliers and found Short Mountain Silica in Tennessee and with the help of Kentucky Mudworks who connected us and vouched for us, we were able to switch our silica source.  We take material source changes very seriously, and we compared the analyses of all our silica products and tested to ensure there would be no noticeable difference. The only thing you should notice is that the bag looks different.