Re mineralizing RO Water - The Planted Tank Forum
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post #1 of 10 (permalink) Old 07-19-2018, 12:31 AM Thread Starter
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Re mineralizing RO Water

Hey everyone, Ive decided to buy an ro system and will need to re mineralize the water. Ive heard that there are a few ways to do this; what would you suggest, something pre mixed like sachem equilibrium or a custom mix of nutrients / minerals. thanks in advance.
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post #2 of 10 (permalink) Old 07-19-2018, 12:56 AM
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Growing is not that difficult.
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post #3 of 10 (permalink) Old 07-19-2018, 01:09 AM Thread Starter
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and that will make my ro water the right parameters for growing plants??
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post #4 of 10 (permalink) Old 07-19-2018, 01:44 AM
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For my RO water I use MgSO4 & CaSO4 for GH, and K2CO3 for KH (or you can use KHCO3).

In the end, separate dry salts are cheaper and provide more control.

Now as to nutrients, that is an entirely different and long discussion.
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post #5 of 10 (permalink) Old 07-19-2018, 03:48 AM Thread Starter
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For my RO water I use MgSO4 & CaSO4 for GH, and K2CO3 for KH (or you can use KHCO3)
I have a few questions

1 what is the difference between increasing the GH with MgSO4 as opposed to CaSO4

2 Do these chemicals have to be aquarium specific for example does it have to be MgSO4 specifically meant for use in aquariums or does it just have to be 100% MgSO4

3 If I were to use MgSO4 & CaSO4 what ratio would I use them at

4 how do I know how much of each chemical per gallon

Sorry for the amount of questions and thanks for the help
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post #6 of 10 (permalink) Old 07-19-2018, 04:21 AM
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go liquid super convenient and more accurate.

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post #7 of 10 (permalink) Old 07-19-2018, 11:27 AM
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Quote:
Originally Posted by JxnDvs View Post
I have a few questions

1 what is the difference between increasing the GH with MgSO4 as opposed to CaSO4

2 Do these chemicals have to be aquarium specific for example does it have to be MgSO4 specifically meant for use in aquariums or does it just have to be 100% MgSO4

3 If I were to use MgSO4 & CaSO4 what ratio would I use them at

4 how do I know how much of each chemical per gallon

Sorry for the amount of questions and thanks for the help
GH is a basically a measurement of Mg + Ca. So it is the combination of both.

People target specific ratios, say 3:1 or 4:1 Ca to Mg. For instance, in my tank it's Ca 35ppm and Mg 14ppm.

MgSO4 and CaSO4 are not aquarium specific. Sponsors here who sell dry ferts have it, and lots of other places too.

As to how much, if you are going to get serious about the hobby, go find the Rotalabutterfly or Zorfox calculators. You enter in your tank size, and it will calculate how much of each you would need to reach a target. These calculators are your friend, and it's worth the time to figure out how to use them.
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post #8 of 10 (permalink) Old 07-19-2018, 02:32 PM
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Quote:
Originally Posted by JxnDvs View Post
Hey everyone, Ive decided to buy an ro system and will need to re mineralize the water. Ive heard that there are a few ways to do this; what would you suggest, something pre mixed like sachem equilibrium or a custom mix of nutrients / minerals. thanks in advance.
Hi JxnDvs
You need to add calcium Ca in RO water in order to grow plants. For your 20 gallon aquarium you need 6.5 g of CaSO4 which will add 20 ppm Ca and 2.8 dGH. If you change 50% water then 3.25 g of CaSO4 and so on.

Magnesium Mg you don’t need to add because it comes daily in the fertilizer. Third is KH, and that is dependent on the substrate.


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post #9 of 10 (permalink) Old 07-19-2018, 02:36 PM
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Last I checked there is insignificant Mg amounts in my fertilizer.... Less than 0.25ppm weekly w/ a 60% wc.

So no, saying you don't need to dose Mg is a little false in many cases.

"No Ice? Just Freeze Some Water"

My 30g (25g after learning how a tape measure works) Journal:
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post #10 of 10 (permalink) Old 07-19-2018, 02:43 PM
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Last I checked there is insignificant Mg amounts in my fertilizer.... Less than 0.25ppm weekly w/ a 60% wc.

So no, saying you don't need to dose Mg is a little false in many cases.
This fertilizer comes with Mg:
Quote:
Originally Posted by JxnDvs View Post
I have the green leaf aquariums PPS-Pro fertilizer and I use the recommended dose daily …


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