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I guess to answer that I'd have to explain all about the differences of RO/DI and Cati Ani. There is no cation anion material in a ro/di filter. It's filtering is done via a membrane. The DI does have limited ability to remove some ion material, but not nearly the quality of cati ani. Make no mistake this isn't a deionization filter. It is what people who traditionally have to change many hundreds of gallon of water use in many cases, and something that has also been promoted by people like Anthony Calfo.
The biggest reason I want a Cati Ani is the fact that there is zero waste water produced. There isn't a constant stream of water being rejected by the RO membrane. And if I can use my RO/DI filter and retro fit it to use the cation and anion material, I will definitely do it. Not only that but the resins can be regenerated too.
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