Dropping seeds in water and discarding the floaters gets repeated constantly, though it says little about whether they will actually sprout. Air trapped in the shell keeps viable seed on the surface for hours, and the germination testing advice at https://calmcbdseeds.com (https://calmcbdseeds.com) suggests a proper paper towel trial instead. Soaking too long drowns them regardless. I plant floaters alongside sinkers now and get comparable results from both.