Everything fits perfectly. Installation was moderately easy. The 5th filter didn't match the existing connections on my system, but a trip to Home Depot for some new fast connections and $5 later, all works great. My system is about 10 years old so I'm pretty sure the connections are outdated anyway. I ran the water through a reverse osmosis system for an hour and it tasted better than ever. Its taste rivals that of bottled water. I drink about a gallon of water daily and after a week the taste of the water hasn't deteriorated. 4 stars for lack of instructions. Even a simple chart is greatly appreciated. Fortunately, I'm not so stupid as not to understand how to reconnect everything after changing the filter.
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