Chlorilong CLASSIC is a 250 g slow-dissolving chlorine tablet containing 92% active substance. A reliable, high-performance product for pool water care.® In addition to the use of high-quality raw materials, an innovative process is used when pressing Chlorilong CLASSIC chlorine tablets: ®the A.P.O.® technology. This technology ensures that the tablet dissolves very evenly and always provides a constant amount of chlorine to the water. The included Silk effect formula increases the anti-scale effect and ensures silky smooth pool water. Without copper sulfate: prevents damage to the pool surface.