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RO/DI water purification filters require regular maintenance to continue to produce pure water. The sediment filter should be replaced as it becomes clogged. The carbon block is very important and protect the RO membrane from chlorines. The carbon block should be replaced every couple of months or more often if you make a lot of water. Use a TDS meter to verify that your RO membrane is producing correctly. You can also use a TDS meter to verify that your DI resins are working.