Lovibond Replacement Reagents for CHECKIT Comparator: Phosphate No. 1 LR Tablets, Range: 0.05 to 4mg/L, White, Composition: Sodium Bisulfate 50 to 60%, Adipic Acid 10 to 20%, Boric Acid 25 to 35%, Citric Acid 0.1 to 1%, Potassium Antimony Oxide Tartarate Hemi hydrate <0.1%, Format: Tablet