I have a three stage RO filter system, which was used for one year for my hot water maker under the kitchen sink. It works well and I would have used it longer, but I bought a new Aquatic Life RO Buddie for a great price (the same price of all the replacement filters). The knock-off one needs new set of filters. It can be upgraded to 4 stage system if you buy an DI canister.
Let me know if you are interested.
Let me know if you are interested.