Water purifier + pre-filter, IQ tax or life necessity？

To be honest, now installed a water purifier have become the new middle class standard. But every time you talk to neighbors and colleagues about this topic, there are always people who ask me with a confused face: “Do you think it's necessary to have a pre-filter in front of the water purifier? Was not fooled into buying expensive goods?” Let's talk about this thoroughly today.

Some friends will say: “My home municipal tap water is not bad ah, with an end of the water purifier is not enough?” These days, even the neighborhood security guards know to add more thresholds to prevent thieves! By the way, I would like to share an interesting story. Two days ago, my family asked the master to install a water purifier, he was working while chattering. I also muttered: “Master, I use municipal tap water, still need to install what pre-filter?” He smiled mysteriously: “Have you ever seen a neighborhood without security? Without it you panic, with it, it seems to be useless.” At that time almost choked me to death. But professionals do professional things, he went on to help me a wave of popularization, so that I “rely on the feeling of purchase” of the small white seconds to understand brother.

What exactly is a pre-filter?
Simply and roughly speaking, it is a gatekeeper. Positioned in the tap water into the first station, like the door of the neighborhood security, the naked eye can see the “big” impurities are all blocked down - what sand, rust, water pipe off the skin off the slag ah, all for you to sieve again. It is generally long “T” type, both sides of the water inlet and outlet, the center of the filter, pore size 40μm (do not look at the number of large, in fact, quite rough).

And the mainstream water purifier comparison:  
Ultrafiltration membrane 0.01μm (already very fine) - RO reverse osmosis more fierce, 0.0001μm (viruses and bacteria can be blocked) so do not expect the pre-filter drink out of the water can be health, it is the essence of the “guardian of the master”. Bacteria, viruses, scale and so on, it simply can not handle. But it cow where? Specializing in “large particles of impurities”, to protect your water heater, washing machine, shower and other small appliances, or blocked up minutes for you to doubt life. Water purifier and pre-filter, not the enemy, is CP good partner!
Many people on the market are entangled in the “water purifier is necessary to install” “Why do I have to add a pre-filter?” In fact, the principle is very simple - water purification system is an assembly line, the lack of anyone can not.  
The pre-filter is responsible for the first round of “sieve gravel” to prevent large debris rushed into the house.
-The end of the water purifier is really responsible for the depth of treatment, the chemical pollutants, harmful heavy metals and what a net. Without the front, your RO membrane life is shortened by half in minutes, but also the old traffic jam; without the end, you drink in is after a rough screening of nature's own adventure drink. So, the two with, with up is called a silky smooth.

Which families must be installed?
1. Newly delivered neighborhoods: the building is newly renovated, all kinds of construction waste is easy to run to the pipeline, every time after the maintenance is a feast of mud and sand.
2. Old broken neighborhoods: ten years old building kind, outdoor pipeline dirty to fly, often repair and mend, small particles of impurities more than outrageous.
3. Remote suburbs / temporary supply wells: no official access to municipal water, with underground wells or temporary supply, large particles of impurities is comparable to the filling of the snacks.
If your home belongs to the above situation, I'm sorry, not installed really lose; the rest of the conditions of good friends, it is also recommended that early prevention, or one day happen to be blinded by the unexpected.
Don't think that adding a pre-filter is paying IQ tax, don't expect it to let you drink to the mineral spring level straight pure good taste. Its greatest significance is to isolate those magazines that can be seen and touched at the door, for the follow-up of all the water equipment to save money, worry, effort, but also extend the life of the entire family purification system.
So, “Is it necessary to have a water purifier together with a pre-filter?” My answer is: it must be arranged if possible!