If I could give this company a ZERO rating or less I would. I wish I checked Yelp before I purchased an Aquacera Twin Counter- top Filter System with 2 filters about 2 years ago. Last year I ordered 2 replacement filters and they worked just fine. The fun started this year, when I placed an order for another 2 replacement filters. The CeraMetrix Ceramic Filter Candle works fine. The problem was/is with the second Filter - Slimline Mount Aqua Metrix Block Filter, which came with the same part number on it, but defective. The part is wider than the old one I purchased last year, therefore, I can not screw it in to the system. First I emailed them. It took them over a week to respond. I filled out the form for return and they were suppose to send me an authorization number... still waiting. I called a customer service then -the girl pretended that she was trying to help, and shortly after our conversation I received an email telling me that they want to know that I will be ordering another item from them. They also stated in the email that I will be responsible for the shipping cost, and the re-stocking fee. EXCUSE ME?! I did not ask for a defective item! So, after 2 weeks, after spending $118, I am still purchasing a water from the store, since I can not use my Twin system with only 1 filter. No one even bothered to apologize for the inconvenience, forget about sending another filter to replace a defective one. What kind of business this crooks are running? Never buy anything from Freshwatersystems, unless you really like huge headaches...