Bromine disinfectant in 20 g slow-dissolving tablets, 1 kg tub. an alternative to chlorine, especially recommended for spas. acts quickly to control algae, bacteria, and fungi in pools and spas. suitable for difficult waters, particularly: with high ph (7.6 - 8.5) and high temperatures (spas) up to 40 °c. reduces, or even eliminates, systematic ph control, leaves no residue, free of isocyanuric acid