I found an analogue on Ali, now I'm waiting. Their sizes there are a couple of millimeters different, I hope this will not be critical. There is an original on Amazon, a pack of two for $ 34, but taking into account the delivery, the effect is leveled, there will be almost no savings. Its pros: The filter is good and moisturizes well. for a room of 20m2 per day, an average of 2 liters of water is consumed With its cons. It does not wash in citric acid, I did not succeed. You have to buy new ones.