Fill water can look perfectly clear and still wreck a startup. If there’s iron, copper, tannins, or other contaminants in the source, they can end up staining a new finish, clouding the water, and turning a “simple” startup into weeks of cleanup. We talk with Joe Laurino of Periodic Products, known throughout the pool industry for Culator metal removal, to get practical about what to test for and how to stop problems before the pool is even full. We dig into the difference between diss...