RO water help for CRS - The Planted Tank Forum
 
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post #1 of 10 (permalink) Old 03-31-2013, 05:32 PM Thread Starter
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RO water help for CRS

So I want to keep CRS. I can get RO water from my LFS but I don't know how to remineralize it. Can you recommend stuff like Salty Shrimp? What are the best GH, KH, etc? I have ADA Amazonia, so that should help buffer, right? Do I need mineral balls?

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post #2 of 10 (permalink) Old 03-31-2013, 06:08 PM
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Here's a good starter for ya: http://shrimpery.com/shrimps


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post #3 of 10 (permalink) Old 03-31-2013, 06:58 PM Thread Starter
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That's great! But can you help with all these RO remineralizers?

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post #4 of 10 (permalink) Old 03-31-2013, 07:25 PM
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Well, I personally use Salty Shrimp and have been very pleased with it. No, you do not need mineral balls.


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post #5 of 10 (permalink) Old 03-31-2013, 07:28 PM Thread Starter
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So I just put that in RO water at the recommended dose and all of a sudden it's safe for shrimpies?

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post #6 of 10 (permalink) Old 03-31-2013, 07:57 PM
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Safe? All RO water is safe for shrimp.

You need hardness to raise the TDS at the specific value for your specie. TDS is linked to the water's osmotic pressure, that's how it affects shrimp. Once the tank is started, you need to bring the TDS up or down and use the remineralizer to raise the TDS which with RO/DI can be 0 or close. This is why large water changes are to be avoided with sensible shrimp.
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post #7 of 10 (permalink) Old 03-31-2013, 08:07 PM Thread Starter
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Thank you! Very scientific- my dad would be proud!
Well the shrimp need hardness and TDS to survive, so RO is not safe straight.

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post #8 of 10 (permalink) Old 03-31-2013, 08:13 PM
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No, it's not. RO water is devoid of all minerals and shrimp need minerals to a certain degree. That's why it has to be remineralized. You can however top off evaporation with just RO water since as water evaporates, it leaves the minerals behind in the tank. So as the water evaporates, the minerals concentrate. That's why it's important to keep the tank topped off so that the parameters don't change.


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post #9 of 10 (permalink) Old 03-31-2013, 08:37 PM
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yepper. TDS is necessary for shrimp. RO with 0 TDS would pretty much mean a slow death for them. That's why you use a remineralizer. The amount of TDS and GH depends on the shrimp.


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post #10 of 10 (permalink) Old 03-31-2013, 09:24 PM
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Long story short, water osmosis phenomenon means water molecules will tend to move to a denser liquid from a less denser as to dilute the denser one. The speed with which this phenomena happens is called osmotic pressure. The greater density difference the larger the osmotic pressure.

All fresh water organisms are hyper osmotic, meaning they have denser fluids inside of them as opposed to the surrounding water. TDS controls the surrounding water's density. The larger the TDS the higher the density. All aquatic organisms have ways of regulating the density of their internal fluids to some degree. This process is called osmoregulation and it's performed by all fresh water creatures, as far as I know.

This osmoregulation process has a low and high watermark and it's specific to individual species. Because of that, you will need to maintain the TDS to a specific range for the specie you are keeping.

What happens when the TDS is lower than the low watermark of your creature's osmoregulatory system: water molecules from the surrounding environment will create an osmotic pressure and actually "push" into the creature making the osmoregulatory system work extra to try to compensate the dilution of internal fluids.

When TDS is too high, the reverse is happening but this is slightly easier to compensate and causes less damage.
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