Carbon Filters for RO Systems
Yes, carbon filters can definitely be used with RO systems, usually as a pre-filter or a polishing stage, depending on what you are trying to improve. I had a small RO setup before, and adding a better carbon block cartridge helped with taste more than I expected. The key is checking the cartridge size and making sure it works with your existing housing, because not every filter is built the same. I came across this under sink water filtration system* while looking at carbon block options, and what stood out was that their filters can also fit universal housings, not only their own unit. I’d still check flow rate, replacement schedule, and certification before adding anything.
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Extra stages can be useful, but they also add more maintenance points. Every cartridge has to be replaced on time, and pressure can drop if the setup is overloaded. A simple layout with compatible standard-size filters is usually easier to manage than adding parts just because there is space under the sink.