四个“二五”饮水消毒法取含有效氯25%的漂白粉2.5克,加水250毫升搅匀,用上清液1汤匙(约10毫升),可消毒饮水25公斤(约1水桶)。【注】若漂白粉含有效氯量为20%,可根据上法代入下面公式计算:公式 N_1:V_1=N_2:V_2N_1代表原用漂白粉有效氯含量V_1代表原用漂白粉数量N_2代表现用漂白粉有效氯含量V_2代表现用漂白粉数量 Four “second five” drinking water disinfection method to take 2.5% of the available chlorine 25% bleach powder, add 250 ml of water and mix well, with the supernatant 1 tablespoon (about 10 ml), sterilizable drinking water 25 kg (about 1 bucket). Note: If the content of available chlorine in bleaching powder is 20%, it can be calculated according to the above formula by the following formula: Formula N_1: V_1 = N_2: V_2N_1 represents the effective chlorine content of the original bleaching powder V_1 represents the original bleaching powder quantity N_2 represents the active bleaching powder available chlorine Content V_2 represents the amount of bleach used