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New to Forum RO/DI Question


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Hello all, I'm Pete from Troutdale and I am new to this forum. I also consider myself new to reefkeeping, I have had my 120 gal, inwall, reef tank for 2 years now. I just changed my membrane in my RO/DI unit (obviously way past due) and I know that somewhere I read that you are supposed to discard the first water produced. But I don't remember how much I'm supposed to discard. I fill two 5 gallon water containers for my top-off system. Can anybody tell me how many gallons I need to discard? I would appreciate it. I will post the details of my tank and hopefully some pics.

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