Water Parameters with new RODI unit - The Planted Tank Forum
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post #1 of 8 (permalink) Old 07-13-2020, 02:29 AM Thread Starter
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Water Parameters with new RODI unit

I installed the SpectraPure MaxCap RO/DI System went through the instructions, made my first batch of water, and this is supposed to be my first batch ready for the tank. These are my water parameters. I just wanted to share them and get some feedback. Does it seem like my PH is too high? I used mostly API test kits and a OAKTON ecoTestr for the PH.
KH = 2
GH = 2
PH=7.3
AMMONIA = 0
Nitrate = 0
Nitrite = 0
Calcium = 120
Phosphate = 0
Copper = 0
TDS = 0

I haven't added anything to the RODI water. This is straight from the reservoir without any Equilibrium or any softeners added pure RODI water.


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FishRoom Bum


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Last edited by DigityDog70; 07-13-2020 at 02:31 AM. Reason: .
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post #2 of 8 (permalink) Old 07-13-2020, 02:34 AM
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How can your Calcium be 120ppm if your TDS is zero?

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post #3 of 8 (permalink) Old 07-13-2020, 02:42 AM
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Agreed, some of those numbers seem odd.
The calcium should have been stripped out. the KH should be basically 0. The GH should not be 2, unless somehow there is calcium left over. But then the TDS would not be 0


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post #4 of 8 (permalink) Old 07-13-2020, 02:44 AM
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Yeah I don't understand?

You say you didn't add remineralizers yet you have a Kh/Gh of 2? Something is off.

And you don't add softeners to RODI. It's already pretty dang soft, lol! :-)

Also, pH of pure RO water takes specialized equipment. Consumer grade tests give inaccurate results.

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post #5 of 8 (permalink) Old 07-13-2020, 03:22 AM
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I believe the only test that is accurate in all this measurements is the TDS. A brand new RO system should give out 0 TDS water. If your TDS test is calibrated property then you don't need to do any other tests, they should all be zero, except Ph of course.

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post #6 of 8 (permalink) Old 07-13-2020, 05:31 AM Thread Starter
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Experience tells me that it's more than likely closer to zero on the GH & PH and I should know better than to let the API tests send me down some rabbit hole. I have more confidence in my TDS meters (both of them) than these cheap API tests.

I've been fiddling with my RO/DI too much today(??). I probably just need a break, come back, look at everything again and "re-test".

Thanks,
F
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Last edited by DigityDog70; 07-13-2020 at 06:08 AM. Reason: .
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post #7 of 8 (permalink) Old 07-13-2020, 06:09 AM
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That sounds better!

And agreed on just testing TDS. You don't test pH of pure RO. What are your plans for Kh?

Once you get some carbonates in the RO water you can get a reliable pH reading.

I target 1 dKh for my tanks and at that level pH is just over 7. In the actual tank the pH depends on many other factors.

My high tech, water change every week, tank sits at 7.1 degassed. Roughly 6.0 with co2 on.

My low tech Betta tank that gets water changes every month or so fluctuates between 6.7, before lights, up to 7.0 after lights have been on for awhile.

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post #8 of 8 (permalink) Old 07-13-2020, 02:47 PM Thread Starter
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This morning:

KH = 0
GH = 0
PH=6.8
AMMONIA = 0
Nitrate = 0
Nitrite = 0
Calcium = 0
Phosphate = 0
Copper = 0
TDS = 0

Should have been more patient but I was admittedly getting a little frustrated. My booster pump is on the way so I can make water faster!
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