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Your post looks like a preliminary advertisement for a quack product designed to extract money from gullible people.
I don't think that it's an advertisment post, just because he is sharing his knowledge about homemade water filters. In fact, I found it very interesting and he is not forcing anyone to buy anything in this article. I found an article about different filtration systems as well and just because I'm sharing it here does not mean I want anyone to buy it - I just find the knowledge about it informative and helpful. The article is German, but non-Native speakers can easily translate it with DeepL or Google Translator: <nope>Have a good day (: