One liter each of the electrolyzed seawaters was produced as mentioned above and was stored in sealed brown bottles at room temperature for up to 3 weeks. Fig. 6 shows chlorine levels of the electrolyzed seawaters and Fig. 7 displays their decrement ratios (i.e., decrement ratio ¼ initial concentration _ final concentration=initial concentration) in the storage period. In general, the chlorine level decreased at the begin-ning of storage and leveled off thereafter, probably due to chlorine and its derivatives being highly reactive compounds, which reacted quickly at the beginning stage ( Fig. 6). Except for T6 treatment, in which the chlorine level was too low to be representative,