It is not just a regular filtration
Minerals, microorganisms, and isotopes are different things. A filter intended for taste or impurities should not be automatically assumed capable of modifying the isotopic ratio of hydrogen. For DDW, the discussion refers to isotopic separation processes. isotopic separation.
The process may have multiple stages
Technical methods may use successive stages to reduce the proportion of deuterium relative to the incoming water. Without a manufacturer's documentation, it is not correct to assume the same technology for all brands.
What should remain transparent
A product presented as DDW should indicate the concentration, unit of measurement, batch identification, and information about the relevant analysis. Ambiguous messages such as "energetic water" do not replace measurable information.
What the process does not demonstrate
The fact that a process is advanced or patented does not prove a medical result. Technology explains the obtaining of the product; independent clinical studies are those that can evaluate claims about health.