It may be that the washing is not thorough, and the treatment method is to replace the filter element.
The TDS value of the water purifier will gradually increase with the rise of the water temperature, and another reason is that TDS is a very sensitive value, even if the purified water is not added to the air for a period of time, the TDS value will be high, so the high TDS value of the water purifier is likely to be secondary pollution of the boiling water equipment, resulting in a higher value.