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What causes organic staining in swimming pools? Why do leaves, pine needles, acorns, berries and other plant droppings stain pool surfaces? The answer to both questions is tannins, and this article will explain more.

This article discusses dissolved metals in swimming pool water, and how they impact water chemistry. For instance, when metals are oxidized, what do they do? We will cover oxidation, staining, sequestration and chelation, and more.