RO/DI water vs other - The Planted Tank Forum
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post #1 of 2 (permalink) Old 09-20-2016, 11:47 AM Thread Starter
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RO/DI water vs other

Quick question. I'm still in the paper phase of setting up a low tech tank. I'm getting all of my ducks in a row before I start purchasing items. Because I have a reef tank, I have a good RODI filter. Should I use filtered water on a planted fresh water tank? Would the discharge water be ok to use? Currently, and this will change as my wife and I are moving, TDS going into the filter are not that high, I just don't know how freshwater plants/fish will react to a higher concentration of dissolved solids.

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post #2 of 2 (permalink) Old 09-20-2016, 01:16 PM
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Although some fish prefer a softer, more acidic water, most tropical fish/plants benefit from the minerals found in most tap water. The discharge water from your RO/DI unit may be to hard to use - you might be better off with just regular tap water and dump the discharge water in the garden or down the drain.
Note: some tap waters are so hard ('liquid rock') they are mixed with RO water at an appropriate ratio.

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