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#6
06-22-2012, 04:35 PM
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This may be safe, but what about nutrient issues with tap water? How do you know what's going into the system every time you do a water change?
My LFS sells RO/DI for 50cents/gal. Your water changes would cost $1.25... If you have an RO system already for top off why not use it for water change as well? 
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