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Old 09-22-2008, 01:20 PM   #11
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Sorry but I am new to this part of fishkeeping. But do you want the combined water to be reading zero after mixing..I thought some minerals, etc had to be added back. Thanks
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Old 09-22-2008, 01:25 PM   #12
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You want 0 TDS out of your source water. Once you start adding trace elements and other thing, your TDS readings will go up.
The TDS meter is used to make sure you are getting pure water out of your tap. The RO won't remove nitrAtes, that's where the DI comes into place.
Here is an easy understanding of RO/DI:
http://www.aquariumadvice.com/articl...ics/Page1.html
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Old 09-22-2008, 09:16 PM   #13
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readings

In a well cycled tank....Ammonia should be zero, Nitrites should be zero, nitrates should be very low (less than 20PPM..or even less than 10PPM for Discus) Ph will depend on what fish you intend to keep. I keep my discus at 6.8 with a TDS around 100-150 and a temp of 84 degrees F. Hope this helps
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Old 09-22-2008, 09:21 PM   #14
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Reverse Osmosis

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In a well cycled tank....Ammonia should be zero, Nitrites should be zero, nitrates should be very low (less than 20PPM..or even less than 10PPM for Discus) Ph will depend on what fish you intend to keep. I keep my discus at 6.8 with a TDS around 100-150 and a temp of 84 degrees F. Hope this helps
Wow, my TDS doesn't go over 20.
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Old 09-22-2008, 09:29 PM   #15
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Thanks for the link..My source water (city water) has high ammonia levels (.50) and ph of 7.6 or higher (hard to get colors compared exactly) and no nitrates. My water after R/O DI as expected is no ammonia but lower ph (around 6). To get my ph of my tank down to 6.5 do I mix some source water with processed water to maintain an overall 6.5 ph..I guess my main confusion is what to add to my processed water to keep ph levels at 6.5 if I do indeed go with Discus. What kind of test results am I looking for when I combine the source and processed water..I really appreciate your help..
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Old 09-22-2008, 11:02 PM   #16
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Wow, my TDS doesn't go over 20.
I've run mine that low, but have found the PH to be quite unstable and unpredictable.
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Old 09-23-2008, 02:48 PM   #17
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Oooops, I meant my TDS meter.
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