I bought this to replace the filter filter and it definitely fits and I haven't had any water flow issues. BUT - it doesn't actually filter as well as a filter: I had absolutely no chlorine taste or smell with the filter filter, but this one smell of chlorine (fluoride? I don't know exactly what that is) is strong enough that I can't drink water. I'm throwing this one away and ordering a filter. You might want to save yourself the trouble of skipping this if you're sensitive to chlorine and/or just want a better quality filter.
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