It depends on what your water is personally like. You'll likely hear others (and possibly those from this forum) that will say Ro/Di is the "only way" it can be done. Personally, the water around my area isn't horrid, so it can be used straight from the tap. Some have huge issues with algae, phosphates, etc. from their water, others don't. Ro/Di is a good add-on, but it's not absolutely vital for any tank in most situations.
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If you put "u" instead of typing out the actual, shocking, three letter word... i'm not going to read your ramblings.
I'm so behind it's not even funny.
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