I was using the regular chlorine remover that consists of sodium thiosulphate solution, which is good for chlorine, but I found that my office fish tank was not doing well, especially in terms of shrimps and sensitive fishes. After some inquiries, realized that the office supply had chloramine, which is not removed effectlively by the regular sodium thiosulphate solution. This product is very effective and after 2 water changes (treated with this product) there was a very noticeable change in the peaceful movement of the shrimps and fish. Definitely worth the buy.