Bought, installed and used this product 2 months ago. Today we test water from this filter and tap water. Both give the same quality!. We thought maybe something is wrong with the tester, then we test other water with the tester, the tester works. Does in vain mean I set this filter? Is there anyone who has bought this product and tested the water? I am so disappointed. I would like to receive a reply from the seller.
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