Re Mineralizing RO water - The Planted Tank Forum
 
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post #1 of 9 (permalink) Old 12-11-2015, 03:14 AM Thread Starter
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Re Mineralizing RO water

My tap water is 10 GH and 10KH with 215 TDS ph 8
I diluted my water to 2KH and 2GH tds was 59

I wanted my kh to be 2 and GH to be 7-8 for my shrimp (RCS)

I added seachem equilibrium enough to raise it to 7 and TDS is 260 now.

How can it be a lower KH and GH and be a higher TDS?

I'm not really happy with equilibrium for a couple reasons, it is raising tds really high and it doesn't dissolve very well. I've been putting it in a 5 gallon bucket and it just wont dissolve at all I am still seeing it at the bottom of the bucket after a day, I have it heated and mixed with a pump.

There has to be a better product out there to remineralize RO water.

What does everyone use? where is the best place to purchase said product?
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post #2 of 9 (permalink) Old 12-11-2015, 03:40 AM
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Kh & gh

Quote:
Originally Posted by latchdan View Post
I wanted my kh to be 2 and GH to be 7-8 for my shrimp (RCS)
1) KH is a measure of alkalinity, and main component of alkalinity is HCO3- (or CO3--) ions, so whatever HCO3 compound will raise your KH. Most people use NaHCO3 for raising KH.

2) GH is a measure of total hardness which consists of Ca++ and Mg++ ions, so whatever Ca and/or Mg compound will raise your GH. Most people use CaSO4*2H2O (or CaCl2) and MgSO4*7H2O for raising GH.

This way (by using these compounds only) you won't raise your TDS too much. In commercial products like Dennerle ReMineral+, Sera Mineral Salt, or Seachem Equilibrium there are other ingredients also which then raise you TDS more than if you were using only the above compounds.

PS: If you use some compound containing both HCO3 and Ca/Mg (like CaCO3), then you raise your KH as well as GH at the same time.
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post #3 of 9 (permalink) Old 12-11-2015, 08:31 PM
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Will not CaCO3 react with water n produce CO2 ??

CaCO3 + H2O = Ca (OH)2+ CO2

Co2 will escape from water... OH will buffer PH to alkaline ....i think this reaction is exothermic in nature n will produce heat.....

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post #4 of 9 (permalink) Old 12-11-2015, 09:28 PM
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You're comparing apples to oranges. TDS is total dissolved solids. KH and GH are measures of the amount of various molecules in water.

Let's say you add 1,000 mg of a mixture of sugar and salt to a liter of water. You will be raising the TDS 1,000 ppm. What's the PPM of sugar in the water? Well we don't know because we don't know the amount of sugar in the mixture. It works the same for KH and GH. Sure you may add enough to raise TDS to whatever you want. However, the KH or GH will depend on the mixture. See the difference? Hence the reason Marcel suggested using chemicals to target GH specifically.

If you don't want to spend a fortune on special shrimp GH booster I would use individual chemicals as Marcel suggested.
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post #5 of 9 (permalink) Old 12-11-2015, 09:58 PM
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I use Salty Shrimp GH/KH+
It's their specific remineralization product for RCS. It raises GH twice as much as it does the KH so it's a good ratio. It can be a bit pricey, I get it from my favorite on line "LFS" but Amazon carries it too.

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post #6 of 9 (permalink) Old 12-11-2015, 11:47 PM
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Quote:
Originally Posted by Pinaki_Pal View Post
Will not CaCO3 react with water n produce CO2 ??

CaCO3 + H2O = Ca (OH)2+ CO2
Water contains CO2, and this CO2 changes the reaction.

CaCO3 + CO2 + H2O -> 2HCO3- + Ca++

Feel free to edit.
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post #7 of 9 (permalink) Old 12-11-2015, 11:56 PM
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Seachem Equilibrium also has potassium. This is why the TDS rose so high.
If you JUST want to adjust the GH then add the right amounts of calcium and magnesium from the materials listed above.
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post #8 of 9 (permalink) Old 12-12-2015, 12:22 AM
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Quote:
Originally Posted by Daisy Mae View Post
I use Salty Shrimp GH/KH+
It's their specific remineralization product for RCS. It raises GH twice as much as it does the KH so it's a good ratio. It can be a bit pricey, I get it from my favorite on line "LFS" but Amazon carries it too.
I used to use equilibrium with RO and had numerous shrimp deaths that occurred randomly. Since switching to salty shrimp things are much better. There are many posts about equilibrium not being ideal for shrimp, that is why I switched. I still use equilibrium, just not in my shrimp tank.
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post #9 of 9 (permalink) Old 02-10-2016, 01:25 AM
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Have any of you guys used the below to raise GH?

http://www.amazon.com/Seachem-Laboratories-Aquavitro-Mineralize-11-8-Ounce/dp/B007GCFVTU/ref=sr_1_1?ie=UTF8&qid=1455071086&sr=8-1&keywords=aquavitro+mineralize
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