We are using the second filter after replacing the first one after 3 months. It fits into our large blue case and is easy to install. When we moved into our house the water smelled strongly of sulfur if we didn't stand even half a day - this filter got rid of the smell. The filter was very black and slimy after 3 months of use so we could try changing it more often but we didn't notice any change in pressure or water quality.
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