No, the dust is from the hydrophobic sand and will not change the urine sample properties in any way. Click here to view a validation study that demonstrates that LabSand provides a clean uncontaminated urine sample, and that the presence of any hydrophobic dust does not affect the urine sample in any way whatsoever. Moreover, LabSand dust particles do not resemble other parameters which may be tested, and as such will not lead to an incorrect diagnosis.