随着水质环境的变化以及人们对健康水质的要求越来越高，现阶段使用家用净水器的比例越来越高，以中国北京为例，每三个家庭就有一个家庭使用家用净水器。
With the change of water quality environment and people's more and more requirements for healthy water quality, the proportion of household water purifiers in Chinese family is higher and higher at this stage. Take Beijing as an example, one out of every three families has a domestic water purifier.净水器滤芯作为关键的配件，大多数家庭选择定期由净水器厂家来更换滤芯，自己完全不清楚净水器滤芯具体是什么，他们的作用分别是什么.为了使大多数用户了解，我们简单介绍如下：As a key part of the water purifier, most families choose to replace the filter cartridges regularly by the water purifier manufacturers or distributors. They have no idea what the filter cartridge is and what their functions are. In order to make most users understand well, we briefly introduce as follows:上图是一个正常净水器滤芯的配置，从左往右，逐级过滤。The figure above shows the configuration of a normal set of filter cartridges, from left to right, step by step.What are their roles? It is described as follows:PP棉：PP棉滤芯主要原料是聚丙烯，也叫聚丙烯熔喷滤芯，是采用无毒无味的聚丙烯粒子制成的管状滤芯。PP棉滤芯的过滤精度0.5μm（微米）到20μm不等。主要用来过滤水中的泥沙、铁锈、胶体、虫卵等杂质，通常是作为净水器的第一级滤芯，更换周期为2到4个月。PP filter: the main material of PP filter is polypropylene, it is a tubular filter cartridge made of non-toxic and tasteless polypropylene granules. The filtration accuracy of PP filter cartridge ranges from 0.5 μm to 20 μm. It is mainly used to filtering sediment, rust, colloid, insect eggs and other impurities in water. It is usually used as the first stage of filter cartridges in water purifier, and the replacement cycle is 2 to 4 months.活性炭：分为颗粒活性炭（UDF）和压缩活性炭、烧结活性炭（CTO），原材料主要有木质炭、煤质炭，果壳炭、石油焦、再生炭和树脂活性炭几大类。主要用来吸附水中的余氯，通常是作为净水器的第二、三级滤芯，更换周期一般为6至8个月。Activated carbon: it is divided into granular activated carbon filter (UDF), someone also call it as GAC, compressed activated carbon filter and sintered activated carbon (CTO). The main materials are wood carbon, coal carbon, shell carbon, petroleum coke, regenerated carbon and resin activated carbon. It is mainly used to adsorb the residual chlorine in water. It is usually used as the second(CTO) and third(UDF) filter cartridges in water purifier. The replacement cycle is generally 6 to 8 months.反渗透膜：孔径为0.0001微米，大于0.0001μm（即0.1nm）的物质，水中的溶解盐类、胶体、有机物、重金属、细菌、病毒等其他物质都会被截留，是目前市面上最精细的一种膜分离产品。通常作为净水器的第四级滤芯，相对于其他的滤芯来说，流经反渗透膜的水更纯净。更换周期为12至24个月。另外，反渗透膜元件会产生废水。不产生废水的膜元件一定不是反渗透膜。Reverse osmosis membrane: the material with pore size of 0.0001 μm, larger than 0.0001 μm (i.e. 0.1nm), and other substances in water, such as dissolved salts, colloids, organic matter, heavy metals, bacteria, viruses, will be intercepted. It is the most refined membrane separation product on the market at present. As the fourth stage of filter cartridge in water purifier, the water flowing through reverse osmosis membrane is more pure than other filter cartridges. The replacement period is 12 to 24 months. In addition, reverse osmosis membrane components will produce waste water. A membrane element that does not produce waste water must not be a real reverse osmosis membrane.T33后置碳：材质也是活性炭，作为最后一级滤芯，作用是进一步去除异味、余氯并抑制细菌，防止净化水的二次污染，改善净化水的口感，使净化水喝起来更好喝。更换周期是6-8个月。T33 rear carbon: it is also made of activated carbon. As the final filter cartridge, it can further remove odor and residual chlorine, inhibit bacteria, prevent secondary pollution of purified water, improve the taste of purified water, and make purified water drink better. The replacement period is 6-8 months.希望通过上述介绍，大家可以更加了解常用的净水装置，更准确和自由的选择适合自己的产品。I hope that this introduction will let you know more about the water purification devices, and choose your own products more accurately and freely.
