It´s high time for a fundamentally new kind of pool water care. BAYROL´s research and development department have come up with a superior chlorine-based pool water treatment concept: VariTab - The advantages of the 2-layer tablet Phase 1: The upper, blue tablet dissolves within about 10 minutes. Part of the chlorine contained in the blue tablet is fast dissolving and is immediately transferred into the pool water through the sand filter. This results in shock chlorination: the chlorine walue rises noticably tor a short time, thus eliminating turbidity and killing any bacteria present. Phase 2: The lower white tablet dissolves slowly and is effective against bacteria, viruses and fungi for 1 to 2 weeks. So, following the shock chlorination, constant and thorough disinfection is guaranteed for the whole of the time it takes to dissolve. At the same time, a flocculant is continously added to remove even the finest particles that cause turbidity. This makes the water much clearer.