It is very important for someone to see the various certifications that exist and which bodies issued them. There are companies in the sector exploiting people’s ignorance which claim to have certification by entities. But when they are asked to show them, they have nothing. Another important factor are the parameters for the tests. For example, some filters may have certification by an organization regarding removal of a parameter such as chlorine. But that does not mean that it removes all the rest also. So, it is very important to check whether it has been tested for different parameters. Finally, there are companies which have a certificate about removal of dangerous contaminants by a local laboratory. Local and small laboratories do not have the means for in-depth testing for all dangerous substances and are not trustworthy.
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