Fi-Clor Premium 5 Easy Chlorine Tablets are specially formulated to out-perform standard trichlor tablets, slowly realising a long lasting disinfectant to kill potentially harmful bacteria and other organisms. They also contain an algaecide to tackle the problem of green water and a clarifier to keep your water crystal clear. The pH properties of these tablets make it easier to balance the water in hard water areas and the product is stabilised to combat wasteful loss of chlorine to sunlight, making them ideal for outdoor pools.