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Dechlorination

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4 articles

Water & EnvironmentalSep 25, 2026 16 min

The Gas Mask Made of Photo Fixer: How Sodium Thiosulfate Met Chlorine in 1915

The Hypo helmet was the first gas mask issued in bulk to British and Canadian troops in the First World War. It was a flannel hood soaked in a solution of sodium...

Safety & HandlingFeb 13, 2026 15 min

PFAS Removal in Drinking Water: The Complete Treatment Train Guide

PFAS (per- and polyfluoroalkyl substances) are a class of over 12,000 synthetic chemicals characterized by strong carbon-fluorine bonds, making them persistent in the environment and resistant to natural degradation. Used in nonstick...

Water & EnvironmentalAug 26, 2025 22 min

An Engineer's Guide to Sodium Bisulfite for Dechlorination

Residual chlorine from pre-oxidation is a silent killer of expensive ion exchange resins, causing premature failure and crippling treatment efficiency. For engineers and operators of arsenic removal and other high-purity water systems,...

Safety & HandlingFeb 6, 2024 15 min

Taming the Tides: How Sodium Bisulfite Revolutionizes Ballast Water Treatment

Sodium bisulfite is a clear, colorless to pale yellow liquid chemical used for neutralizing residual oxidants in maritime and industrial water systems. Its chemical formula is HNaO₃S, with a molecular weight of...

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