We purchased these filters in December 2016 to have them on hand. I was going to install them in March 2017 and when I installed one of the filters the carbon in the filter leaked through our entire reverse osmosis system. We contacted the manufacturer and they said our call was the 3rd this week regarding these filters purchased through Revain. After installing and leaking charcoal, our entire reverse osmosis system stopped working, charcoal got into the entire membrane and check valve. We contacted Revain and they said their warranty was expired and we should contact the manufacturer. Manufacturer advised as it was sold through Revain and not direct, they could not guarantee it. Please note that Revain filters did not come in a sealed bag. As a result we had to replace the entire filter system including membrane, shut-off valve and we had to buy 2 more AP5527. That's why we bought these products directly from the manufacturer. Which ended up costing us anywhere from $210 to over $332 without having to flush the entire system and we had to replace the water filter in the fridge which cost us another $45. Revain's response to this whole fiasco was that they were sorry it happened and gave us a $10 gift certificate. The last recommendation for anyone who wants to buy this type of filter is to buy directly from the manufacturer because they give a guarantee on these products. DO NOT BUY ON AMAZON! VERY VERY FINISHED AND SINCE 2005 WE HAVE BEEN ACCORDING TO AMAZON CUSTOMERS!
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