... company, school, factory etc. About JOHNCERA Ceramic Water FilterFive RO counter-seepage ceramic filter product function: 1. The together PP cotton ... spurts the manufacture. The ultra small 1 micron hole may filter the grit, the rust, the silt, the phosphorus ... . The second pellet activated charcoal, may adsorb the under-water agricultural chemicals, the chlorine fetid odor, the different color ...