5 Actions in only one treatment. Fi-Clor Premium 5 Tablets are specially formulated to out-perform standard 200g trichlor tablets, slowly releasing a powerful, long lasting disinfectant to kill potentially harmful bacteria and other organisms. Premium 5 Tablets also contain an algicide to tackle the problem of green water and a clarifier to keep your water crystal clear. The pH properties of the tablets will make it easier to balance water in hard water areas, and the product is stabilised to combat wasteful loss of sanitiser to sunlight making it ideal for use in outdoor pools.