Uncle Uncle - Need help mixing RO/DI - The Planted Tank Forum
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post #1 of 14 (permalink) Old 11-06-2015, 05:39 PM Thread Starter
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Uncle Uncle - Need help mixing RO/DI

OK, I give.

I need help mixing RO/DI for fish and shrimp (neo's).

20 gallons

I want a GH=8, KH=4, pH=7.2-7.5 and TDS ~ 200

I have on hand:

Ultimate GH Booster
Equilibrium
Replenish
Sodium Bicarbonate
Potassium Bicarbonate
Potassium Carbonate
Alkaline Buffer
Acid Buffer
Fresh Trace


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post #2 of 14 (permalink) Old 11-06-2015, 09:01 PM
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For 20 gal. I would start out with 4 tsp. of Equilibrium and then measure GH. I predict it will be about 6 dkh.

For KH I would start with about 1.5 tsp. of potassium bicarbonate.

I wouldn't worry about pH, and TDS is going to fall where it will. It should be close to the 200 number you want, but with Equilibrium and potassium bicarbonate producing a GH of 8 and a KH of 4 I don't see why you would want to independently alter TDS.
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post #3 of 14 (permalink) Old 11-06-2015, 09:12 PM Thread Starter
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Quote:
Originally Posted by Argus View Post
For 20 gal. I would start out with 4 tsp. of Equilibrium and then measure GH. I predict it will be about 6 dkh.

For KH I would start with about 1.5 tsp. of potassium bicarbonate.

I wouldn't worry about pH, and TDS is going to fall where it will. It should be close to the 200 number you want, but with Equilibrium and potassium bicarbonate producing a GH of 8 and a KH of 4 I don't see why you would want to independently alter TDS.

I'm currently using Salty Shrimp Aquarium GH/KH+ and those are the readings, but I want to make my own formula that is way more economical than $35.00 for 200 grams.

I get about 10 barrels out of a jar for use in 4 tanks. It doesn't last long. Also I wrote to Salty Shrimp in Germany to ask if there is sodium in their formula and they replied that it was good for fish and shrimp. A politicians answer! They completely ignored my question.

I have Panda Cory's and a Betta that are sensitive to sodium. First time I tried it the Betta got a swim bladder problem and the second time I tried it a cory is in severe distress and probably will die.

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post #4 of 14 (permalink) Old 11-07-2015, 12:27 AM
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To increase dGH 8 degrees,

Seachem Equilibrium 35.61 gm approximately 6 3/4 teaspoons
OR
GLA's Ultimate GH Booster 33.1 gm approximately 10 1/8 teaspoons

To increase dKH 4 degrees

Sodium Bicarbonate 9.07 gm approximately 1 1/2 teaspoons
OR
Potassium Bicarbonate 10.81 gm is approximately 10 1/8 teaspoons

Those are in my calculator.

I will have to add Potassium carbonate and Seachem Replensih. As far as the buffers I have no idea. I'm not a big fan of trying to control the PH.
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post #5 of 14 (permalink) Old 11-07-2015, 12:36 AM
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Quote:
Originally Posted by BigXor View Post
I'm currently using Salty Shrimp Aquarium GH/KH+ and those are the readings, but I want to make my own formula that is way more economical than $35.00 for 200 grams.
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post #6 of 14 (permalink) Old 11-07-2015, 01:01 AM Thread Starter
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Quote:
Originally Posted by Zorfox View Post
To increase dGH 8 degrees,

Seachem Equilibrium 35.61 gm approximately 6 3/4 teaspoons
OR
GLA's Ultimate GH Booster 33.1 gm approximately 10 1/8 teaspoons

To increase dKH 4 degrees

Sodium Bicarbonate 9.07 gm approximately 1 1/2 teaspoons
OR
Potassium Bicarbonate 10.81 gm is approximately 10 1/8 teaspoons

Those are in my calculator.

I will have to add Potassium carbonate and Seachem Replensih. As far as the buffers I have no idea. I'm not a big fan of trying to control the PH.
Am I using the API GH/KH test kit correctly in assuming 1 drop = 1 dGH/dKH?

Because before switching to Aquarium GH/KH+, I was using approximately 15 grams of GH Booster for 6 dGH and 2.5 grams of potassium bicarbonate for 2dKH

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post #7 of 14 (permalink) Old 11-07-2015, 02:04 AM
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20 gallons - volume taken by substrate, rocks, wood, whatever - volume missing by water level - inaccuracies in test kit - inaccuracies in your measurement of powder = about right.

Feel free to edit.
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post #8 of 14 (permalink) Old 11-07-2015, 06:03 PM
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Quote:
Originally Posted by BigXor View Post
Am I using the API GH/KH test kit correctly in assuming 1 drop = 1 dGH/dKH?

Because before switching to Aquarium GH/KH+, I was using approximately 15 grams of GH Booster for 6 dGH and 2.5 grams of potassium bicarbonate for 2dKH
You are using the test correctly. There are many possible reasons for the discrepancies as Audionut pointed out.

I am quite confident in regards to the GH calculations. Try Seachem's calculator for Seachem Equilibrium.

Input 11 gallons, current GH 0, desired GH 8

The result will be 70.4 grams. The reason it is twice as high as mine is that they are reporting meq/l NOT GH as it appears. I'm not sure why they have GH and meq/l on the same inputs. Quite confusing.

Long story short, to convert meq/l to dGH divide by 2. I won't go into the whys because it's pretty dry reading for the non geeks lol. Doing that you will have the same dose as I suggested. I use the exact same calculation for every other fertilizer that raises GH.

As far as the KH calculations I will have to double check those. These are new so it is possible to have errors. I'll keep you updated as to my findings.
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post #9 of 14 (permalink) Old 11-07-2015, 07:16 PM
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Zorfox, I think there is something odd in your numbers.
Potassium bicarbonate and sodium bicarbonate are not exactly the same dosing, but in post #4 you have suggested 10x as much potassium bicarbonate as sodium bicarbonate where you have converted to teaspoons.
I think these should be a lot closer.
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post #10 of 14 (permalink) Old 11-07-2015, 08:23 PM
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Quote:
Originally Posted by Diana View Post
Zorfox, I think there is something odd in your numbers.
Potassium bicarbonate and sodium bicarbonate are not exactly the same dosing, but in post #4 you have suggested 10x as much potassium bicarbonate as sodium bicarbonate where you have converted to teaspoons.
I think these should be a lot closer.
I agree. Nice catch!

I just finished checking the "theoretical" calculations for raising KH using Sodium Bicarbonate. The numbers seem spot on with other sources.

Water Hardness
Aquarium & Reef Calculators - Bulk Reef Supply

I am using the same calculation for other chemicals that increase KH. Therefore, I think the numbers should be accurate.

The teaspoon measures however are suspect. I don't have any Potassium Bicarbonate to weigh so if anyone does please let me know. I do have Sodium Bicarbonate. I weighed 5 times and took an average. The numbers are close to what I had before 4,530 mg/tsp.

I'll contact the source of the Potassium Bicarbonate weights (a user here) and verify. The current number is 1,069 mg which seems quite low to me compared to NaHCO3.
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post #11 of 14 (permalink) Old 11-07-2015, 10:36 PM
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I checked NaHCO3 and came close to your measurement @Zorfox. Must have been having a braindead moment when I measured 5.7grams.

I'll check NaCl at some stage since that's probably high too.

Feel free to edit.
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post #12 of 14 (permalink) Old 11-10-2015, 03:39 AM
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I weighted Potassium Bicarbonate that I have: 1 tsp - 6.25 g. 1 tbsp gave me 18.92 g. So, probably 6.3 g per tsp will be a pretty close approximation.
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post #13 of 14 (permalink) Old 11-10-2015, 03:58 AM
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The molar mass of NaHCO3 is about 15% lighter then KHCO3, so I would expect KHCO3 to be heavier all other things being equal.
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post #14 of 14 (permalink) Old 11-10-2015, 04:40 AM
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Hmm, it is definitely heavier: 6.3 g for KHCO3 vs 4.5 g for NaHCO3 (Zorfox data).
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