... , factory etc. About JOHNCERA Ceramic Water FilterFive RO counter-seepage ceramic filter product function: 1. The ... , the phosphorus pollution nature, each kind of colloid and so on. 2. The ... aseptically filters, may retain under-water to the human body beneficial mineral substance ... Johncera has already largely developed Alumina, Zirconia, Silicon Carbon, Silicon Nitride and other special materials ...