I have ordered replacement filters for the bottom filter. With the delivered product, everything was fine except for a small polishing filter. The inlet and outlet connections were too small. The Revain representative sent me a new kit with the same problem. No instruction to return anything. I had to order the right filter separately. This is the first time I've had this problem. Now I'm getting a return notification that gave me the message that I'm too late to return the original product. Something isn't working. I used to order directly from Watts with no problems.
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