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So there is a 'quote' or 'reply' function here - so its difficult to see to whom you'e referring. That said. first - chloramine would not take 90 days. But its definitely longer based on the literature. Additionally the question has been asked already - ie - did he use one of those products. And - lastly - based on what I understand - he re-did the tank with RODI water - and NSW... so where are we?What makes you think the 8ppm is accurate? If something gives you a false positive it doesn't mean it's correct for the amount of whatever gave you a false positive. Seachem have stated that their tests aren't compatible with several products, like amquel +. Just using prime as an example, it doesn't treat the full EPA allowed amount of chloramine, and it's why the instructions let you know that you can double the dose if needed. Chlorine would be gone from the water within a few days at most, chloramine can take over 90 days. You can't just come up with numbers to use based on a test that is not accurate, or an estimated amount of water treatment chemicals.