KHSO4 Water-soluble, colorless crystals, melting at 214°C; used in winemaking, fertilizer manufacture, and as a flux and food preservative. Also known as acid potassium sulfate; potassium acid sulfate.
The chemicals used are dilute potassium hydroxide for high-pH cleaning and potassium bisulfate instead of sodium-based caustic, citric acid or other organic cleaners.
To avoid, check ingredient listings on labels for the various forms: sulfur dioxide, sodium sulfite, sodium bisulfate, sodium metabisulfate, potassium bisulfate and potassium metabisulfate.
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