I found that there are an oily residue on the surface of my tank even after thorough rinsing of the TS black diamond blasting sand. Someone suggested removing it, placing it into a bucket, adding some Dawn dishwashing detergent, followed by mixing and thorough rinsing. Though I don't doubt that will work I did not want to have to do that with (effort/risk).
From an aesthetics point of view, I did not like the shiny, sparkly reflections the blasting sand produced. I prefer a more matte, dull look.
Sent from my iPhone using Aquarium Advice