And probably saved you some severe damage to your lungs. Diatom powder, when allowed to go airborn (as in using it in non-intended equipment), can deposit in the alvioli in your lungs and cause a type of silicosis with the same symptoms as emphysema. Once in your lungs, the diatom granules are trapped for good and continue to scar and disable parts of your lungs. The damage is non-recoverable.