The filter device made by yourself (filtered with sand) can you drink it after filtering? How do you think of using sand.I haven't learned physics.
What is the central water purification front filter? The front can only solve the pollutants of large particles (20-40 microns), such as sediment, colloid, some red worms, etc. The filtration accuracy is not high, and it is impossible to improve the taste of water and remove harmful substances such as bacterial viruses. The advantage is that the service life is long (it can be washed regularly) and the price is cheap. it can protect the filter element for the water purifier installed behind and prolong the service life of the water purifier filter element. Therefore, it is generally used as a water purifier.If the turbidity of your tap water is very high, this filtration can effectively reduce pollutants. if you are safe, of course, you must install a water purifier, not just a front. The two complement each other, not substitute. Generally refers to the coarse filtering of the first level. The front is dedicated to filtering impurities of large particles such as sediment, and the effect is relatively primar