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Is it necessary to install the pre-filter after installing the ultra-filtration water purifier? Can be installed. The front cover filter is cheap. It can protect and ensure cleaner water quality.

Can a water filter harmful substances? Can the common cotton core and carbon core filter most harmful substances? There are many kinds of harmful substances. I don't know if you are the specific one or all. for example, the size of E. coli is 7 microns. In theory, the filter with filtration accuracy less than 7, it is possible to filter out the harmful substances of E. coli, but some harmful substances have small particles, so it is not easy to say, and some are poisonous, such as pesticides and microorganisms, which may be less than 7 microns, therefore, some of them can pass through, which is certain. As for how much, it is necessary to analyze the specific problems that small microorganisms can filter! But it is not necessarily harmful to see what it is! You can filter most of that!