The "Controlled discharge toilet system" or Bio toilet water is supposed to pass through chlorine to kill foul smell in railway coaches. But this never work properly in our IR and journey in non-AC coach is a pain with headache caused by this foul smell. As soon as the train achieve about 60 Km speed, smell sweeps across. More over the use of poisonous cleaning solvents kill all the anaerobic bacteria in the tank, so proper decomposition never happens as the experts prediction. Result is aerosol formation of waste passing through coaches and Breathing this will make you sick.