After 4 years of using this filter. Average 1 gallon per day. The service life of filter cartridges is approx. 3 months. Several times longer. Now about 3-4 weeks with low flow. The photo uploaded is of a 31 day old replacement filter. Today, after only 14 minutes, I was able to draw a full liter of water from it. It's been like this for a while. I even replaced the filter housing thinking it took 4 years to replace. The problem persisted but I got reasonable filter life with a new cartridge with a new filter. Now I'm looking for another brand to replace this one. I see no reason to ask for a replacement for this replacement.
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