Making the switch to RODI - The Planted Tank Forum
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post #1 of 4 (permalink) Old 07-29-2017, 06:49 AM Thread Starter
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Making the switch to RODI

I'm almost finished setting up my new RO/DI system. In addition to using this water on a new tank I'm assembling, I'd like to convert my existing tanks to the new water.
I currently have two 20 gallon aquariums. The pH is 8.4 with a TDS ~700. I haven't quite nailed down the aged water chemistry yet, but I'm aiming for a pH around 6.5 - 7, GH 6 and KH 3.
I do weekly 50% PWCs on these tank. My uneducated plan is to just replace 1-2 gallons of tap water with the new remineralized water during the PWC and to just keep an eye on the pH until I get close enough to switch over completely. I say "uneducated plan" because I'm not basing it on anything... it just seems right in my head. I'm posting this thread in hopes of getting an educated opinion. Am I on the right track? I just pulled the 1-2 gallons number out of thin air. Is there a way of finding out the right/safe volume to mix in every week? It's been a while since high school chemistry class for me.
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post #2 of 4 (permalink) Old 07-29-2017, 01:54 PM
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A ph 8.4 and tds of 700?

I'm in Detroit and my ph is 7.2 and a tds of 125 out of the tap. I can go weeks on end with no water change and the highest I've seen my tds is 350.

I'm not real familiar with RO water though. I know anubias don't react well to it.
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post #3 of 4 (permalink) Old 07-29-2017, 02:54 PM
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I think I'd mix your tap water 50/50 with the new RO water (no additives) and test for TDS and gH/kH and see what you get. Then adjust as needed. Would seem a better approach than pure RO that you have to mess with minerals and pH.
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post #4 of 4 (permalink) Old 07-29-2017, 05:15 PM
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I think that's a good conservative plan. I have similar liquid metal type water parameters out of the tap and I mix close to 95% RO (not RODI, which takes out everything), with tapwater and my parameters are around 100tds, neutral PH, KH around 4.
I don't have to add anything to the water because even after running it through the RO unit it still measures around 75ppm tds. So I just add in a small amount of tapwater to get the mineralization a bit higher.
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