ALWAYS USE FOOD GRADE! I have more videos on diatomaceous earth explaining the difference between food and filter grade diatomaceous earth. Filter grade is used for water filtration and contains high levels of crystalline Silica, not safe for breathing at all. Now food grade diatomaceous earth contains less than 1% of crystalline Silica, it is safe for human use and consumption but here is the catch, you don't want to be breathing in loads of this stuff, it will not cause permanent damage like f