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#11
06-22-2012, 02:45 AM
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Yup. That is green DI resin in the canister.
Usually it is the last stage of filtration: after the RO membrane. The difference in this setup is that you can't "T" the line off to collect RO water and RO/DI water separately. That's fine for your aquarium water, but I wouldn't drink the RO/DI water. 
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