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Leslie
I bought a reverse osmosis Filter 1 RO 5-50 from a seller: it has only been working for two months. From the first day, the output was 25 ppm, and the input was 247 ppm. It is stated that the input should be adjusted to 1 liter per minute, but then the output is only 60-70 ppm, while when I set it to maximum flow, the output is 25 ppm. Can this happen? What is wrong? Or should I just not worry and install resin?