The purpose of this study was to evaluate the effect of time, storage temperature and type of solution to the stability of Haiter. Iodometric titration method was used to determine the amount of available chlorine which indicated the stability of Haiter. Both types of Haiter, regular type and perfumed type, at 6% and 3% concentration which stored in air-conditioned and room temperature were studied. Samples were stored in tightly covered amber glass bottles at room temperature and measurement of available chlorine was done at week 0, 2, 4, 8 and 12. Results showed that the effect of time to the stability of Haiter was significantly different at the second week of the study (p<0.05). Storage temperatures and types of solution had no effect to the stability of Haiter.The purpose of this study was to evaluate the effect of time, storage temperature and type of solution to the stability of Haiter. Iodometric titration method was used to determine the amount of available chlorine which indicated the stability of Haiter. Both types of Haiter, regular type and perfumed type, at 6% and 3% concentration which stored in air-conditioned and room temperature were studied. Samples were stored in tightly covered amber glass bottles at room temperature and measurement of available chlorine was done at week 0, 2, 4, 8 and 12. Results showed that the effect of time to the stability of Haiter was significantly different at the second week of the study (p<0.05). Storage temperatures and types of solution had no effect to the stability of Haiter.