The drafting meetings of four national standards for water purifiers, namely, UV sterilizer for household and similar water purifiers, pressure tank for household and similar water purifiers and nanofiltration water purifier, were held in Kunming, Yunnan Province on May 20 17-09 and May 20 13.
Among these four standards, the first two are national standards for water purifiers and mandatory safety standards; The latter two are industry standards and recommended product standards.
Extended data:
Working principle:
The first stage: PP cotton: remove all kinds of visible objects/dust and impurities from tap water.
Second and third stages: Pre-activated carbon: The third stage of some low-grade water purifiers is also PP cotton, and activated carbon removes chlorine and organic impurities. It can also absorb the peculiar smell, color and smell produced by organic matter in water.
The fourth stage: ultrafiltration or reverse osmosis membrane: the membrane can remove bacteria, viruses and spores from water.
Stage 5: Post-activated carbon device: further improve the taste and remove the odor.
Baidu encyclopedia-water purifier