• Bromine-based swimming pool sanitizer in tablet form
• Active ingredient is bromo-chloro-5,5-dimethylhydantoin (BCDMH) at 94–98% w/w
• A halogenated hydantoin — a different chemistry from chlorine pucks or granules; it does not add cyanuric acid stabiliser to the water
• Very low water solubility (0.22 g/100 mL at 25°C), suited to a feeder or floater

Water chemistry target

Regal®’s Canadian Pool Care Guide states, for pools sanitised with bromine: “A free bromine level of 3-5 ppm is the target range.”

Safety, handling and storage (from the Regal Elite Brom Tabs Canadian Safety Data Sheet, issued 23 April 2024)

• Signal word: DANGER. H302 — Harmful if swallowed. H314 — Causes severe skin burns and eye damage. H317 — May cause an allergic skin reaction. H400 — Very toxic to aquatic life.
• Keep container tightly closed when not in use. Avoid contact with skin, eyes and clothing.
• Storage: “Keep away from all sources of ignition. Recommended storage temperature below 30°C. Store in a dry, well-ventilated area. Store away from incompatible materials.”
• Conditions to avoid: exposure to moisture; heating above the decomposition temperature.
• Incompatible materials: oxidizing agents, bases and combustible organic materials. Never mix this product with any other pool chemical, including chlorine products.