When you buy it (they don't tell you that it has 2 filters and changing them costs 120 euros), they tell you that the filter costs 60 euros. Until it's time to change them. Then you realize how much of a rip-off it is. They deceive people while, after all, if it requires 2 filters, you can only buy one. That is, buy one shoe now and the other later. The filters should have come as a set with whatever price they have. It is misleading that the filter costs 60 euros when it requires 2. Their entire commercial policy is utterly unacceptable.