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What are your thoughts on RO - RO/DI water for freshwater planted tanks?

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-Used it with tap water and it helped
That would be my vote. Alone, R/O units don't help at all (need to reconstitute water). My tap water has changed recently so I only use the unit for toping off. I like to have control over my water parameters, others feel like it's to much work. I used to use R/O tap water mix on a 20 gallon, anything bigger might be to much work.
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