White sand? Make sure you use a good mask. Look up Silicosis.
I first heard about this disease as a kid visiting Virginia City, Nevada near where I grew up. They talked about how the miners breathed in the silica dust while drilling. All the saloons had spittoons on the floor, not necessarily for tobacco spit, but for blood that the miners would cough up. Eventually they would die of asphyxiation due to the scar tissue build up in the lungs. They added water nozzles to the drills to spray down the rock to keep silica out of the air.
Just one reason I decided not to do my own sandblasting.
