Translations:AY Honors/Whistles/Answer Key/67/en
From Pathfinder Wiki
Round the top edge of the pipes with wet sandpaper while you hold the pipe under a stream of running water. This is to keep the dust down. This is an important precaution against inhaling PVC dust which never decays and will therefore settle permanently in the lungs if inhaled. If you do decide to dry sand, you and everyone in the room should wear a dust mask.
