All in one  Tab are slow-release tablets form water treatment chemicals, it manufactured by isolating, wrapping, release-controlling and then pressing it into solid tablets with the high-pressure. Its formulation set contains ferrous metal corrosion inhibitor, non-ferrous metal corrosion inhibitor, scale inhibitor,� dispersant, deposition� inhibitor, microbial control agent, with the effects of corrosion inhibition, scale inhibition and antibacterial. All in one Tab have more than 95% active ingredients, depend on controlled release technology-CRT it can continuously release active ingredients to water. The recommended dosing concentration of All-in-one� Tab� is 20-30ppm. You may simply hang the tablets in the water distribution pan or water collection pan of the cooling tower and other places where the water will go through. The tablets will dissolve and release active ingredients slowly for up to three to four weeks, and then be replaced after complete dissolution.