Pool & Spa pH Reducer | pH Down | Sodium Bisulfate | Muriatic Acid Replacement - 25 lb Pail CONCENTRATED Granular Sodium Bisulfate. BIODEGRADABLE, Non Toxic, Safer the Muriatic acid 10 LBS of granular pH Reducer = 1 gal. muriatic acid SAFER and easier to store. Proudly Made in the USA. INITIAL Dosage: 15-30 oz. per 10,000 gallons.