It's been running flawlessly for three years now. We live 2 adults + 2 children, so the expense is quite large. We use water from the filter in full: tea, cooking, iron, humidifier, plus we drink a lot of just boiled water. So the membrane was changed after 1.5 years (it is designed for a maximum of 2). Before buying, I advise you to measure the pressure in the water supply (this model requires at least 3.5 atmospheres).
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