I have been using these cartridges for a long time. Before buying on , I made an order in amazon and the cartridges from there did not last even a week, as there was tap water, it was filtered. Bought on - everything is fine. Filters as needed. I use the filter very often, we drink water + water in the kettle + all the water for cooking food is also from there. It lasts an average of a month. If you do not pour into the pans, then all 2-3 will be pure water.
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