Fracking sand is used a lot more because it is much cheaper than ceramic, around 25%+ cheaper but they prefer to use ceramic proppant due to it's higher output ability, strength and other factors.
So if we can offer a ceramic proppant for the price of fracking sand or there abouts then it does not take a genius to see how big the market would be for this product.
It could potentially dominate the entire ceramic proppant industry.