I met a friend who is an agent for water system from a Malaysia manufacturer and he told me that all water systems from Malaysia are manufactured by the same factory. He asked me not to buy the Diamond one as it is selling at HK$6,000+ but another brand is selling at only around HK$1,600 and they have almost the same functions (the cheaper one is even better). I have ordered the HK$1,600 one and it will be delivered to me next week.