Remineralizing RODI water - The Planted Tank Forum
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post #1 of 44 (permalink) Old 07-03-2019, 06:57 PM Thread Starter
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Remineralizing RODI water

What is everyone using that need to remineralize their RODI water. Seachem is what google returns.

Thanks
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post #2 of 44 (permalink) Old 07-03-2019, 06:58 PM
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CaSO4 - For Ca
MgSO4 - For Mg
KHCO3 - For kH

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post #3 of 44 (permalink) Old 07-03-2019, 07:08 PM
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Gh boost for gh, and baking soda for kh.
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post #4 of 44 (permalink) Old 07-03-2019, 11:14 PM
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2 tablespoosn of MgSO4, 1 tablespoon of CaCl2, 1 tablespoon of CaSO4. Blended together in a spice grinder. 1/2 tsp per 5 gallons raises gh by about 4. 1/8tsp of potassium bicarbonate in 5 gallons ups kh by about 1. and if you dose just that in all your WCs you dont need k2so4 in addition to the K from KNO3 or KH2PO4.
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post #5 of 44 (permalink) Old 07-03-2019, 11:50 PM
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If you want to buy the compounds that most of us use, @plantbrain and many others sell them. For something off the shelf, Seachem Equilibrium will work for most purposes, and Salty Shrimp GH and Dennerle's GH+ are out there if you only want to boost GH and not KH (Caridina shrimp, micro rasboras and such). Of course, these can be bought as separate mineral salts as well.
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post #6 of 44 (permalink) Old 07-04-2019, 01:55 AM
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I just set up an RO system this week and am currently filling up a 38gallon tote.

Can I just go to Home Depot/Lowe's/Walmart and buy epsom salt and gypsum for MgSO4 and CaSO4?

Also is there a bicarbonate that y'all prefer for raising kh? Baking soda is cheap and easy to get.

Edit: My concerns would be to a) make sure they are pure epsom salt and gypsum... not cut with anything, and b) would be better to buy from a local small business or other aquarium hobbyist instead of a big box store
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post #7 of 44 (permalink) Old 07-04-2019, 02:13 AM
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I follow this: James' Planted Tank - Re-mineralising RO Water

So far it's worked well but my tank is not quite 2 months old, time will tell.
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post #8 of 44 (permalink) Old 07-04-2019, 03:24 AM
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Originally Posted by jcoulter View Post
Can I just go to Home Depot/Lowe's/Walmart and buy epsom salt and gypsum for MgSO4 and CaSO4?

Also is there a bicarbonate that y'all prefer for raising kh? Baking soda is cheap and easy to get.
Local grocery store would have epsom salt.
MgSO4*7H2O (heptahydrate)
Any local home brew store for beer making should have food grade gypsum around $5 per pound.

I prefer CaCO3 for raising KH, some use potassium carbonate too.
I try to limit excessive potassium and never use a sodium based product such as baking soda.

Hope this helps.
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post #9 of 44 (permalink) Old 07-04-2019, 03:29 AM
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Quote:
Originally Posted by jcoulter View Post
Can I just go to Home Depot/Lowe's/Walmart and buy epsom salt and gypsum for MgSO4 and CaSO4?

Also is there a bicarbonate that y'all prefer for raising kh? Baking soda is cheap and easy to get.
Local grocery store would have epsom salt.
MgSO4*7H2O (heptahydrate)
Any local home brew store for beer making should have food grade gypsum around $5 per pound.

I prefer CaCO3 for raising KH, some use potassium carbonate too.
I try to limit excessive potassium and never use a sodium based product such as baking soda.

Hope this helps.
Thanks!

Follow up questions:
Where do you get your CaCO3?
Can you elaborate a bit as to the negatives of excess K?
Why do you steer clear of sodium based products such as baking soda?
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post #10 of 44 (permalink) Old 07-04-2019, 03:38 AM Thread Starter
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Thanks everyone. Is there a benefit to mixing individual components versus seachem or some other product? Iím knew so I have no idea at this point if I need a specific mineral content.
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post #11 of 44 (permalink) Old 07-04-2019, 03:50 AM
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Thanks everyone. Is there a benefit to mixing individual components versus seachem or some other product? I’m knew so I have no idea at this point if I need a specific mineral content.
Seachem can work for a lot of people, especially low tech tanks. In a lot of cases, it is fine.

Dosing individually always you to custom tailor your water for your plant needs and allows for more control. This can make a difference if you notice a deficiency in your plant growth. In my case, I have a lot of fish that provide plenty of nitrate. Because of that, I don't dose any extra nitrate.
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post #12 of 44 (permalink) Old 07-04-2019, 03:59 AM
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Where do you get your CaCO3?
Can you elaborate a bit as to the negatives of excess K?
Why do you steer clear of sodium based products such as baking soda?
CaCO3 happens to come from work, tons of it used during the cold weather months.
Can be purchased from Ebay, Alpha Chemicals I believe, it is cheap.

Excessive potassium, is it a myth, I can't say.
With higher alkalinity it is claimed as a problem.
I tend to steer clear of problems even if they could be a myth.

Sodium is not required by plants, why introduce it?
Lots of people use baking soda, I have in the past but no longer.

So how much KH/alkalinity is really needed in a tank.
.5dKH or roughly 8ppm of carbonate hardness is all.
Plants will appreciate a lower alkalinity anyway.
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post #13 of 44 (permalink) Old 07-04-2019, 03:06 PM
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Lots of ways to do it.

Easiest and most flexible is as mentioned above, CaSO4 and MgSO4 for GH. They are cheap anywhere that you buy them.

For KH, personally I use K2CO3. But I am only raising my KH to one, so not much excessive K. Really no need to raise beyond that in my opinion. If you want to further lower K, you can use MgNO3 for Mg & NO3. That is what I am currently doing.

Either way, Rotalabutterly or Zorfox has calculators that make it easy to figure out the actual dose.
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post #14 of 44 (permalink) Old 07-04-2019, 04:18 PM
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Lots of ways to do it.

Easiest and most flexible is as mentioned above, CaSO4 and MgSO4 for GH. They are cheap anywhere that you buy them.

For KH, personally I use K2CO3. But I am only raising my KH to one, so not much excessive K. Really no need to raise beyond that in my opinion. If you want to further lower K, you can use MgNO3 for Mg & NO3. That is what I am currently doing.

Either way, Rotalabutterly or Zorfox has calculators that make it easy to figure out the actual dose.
Where do you buy the k2co3?
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post #15 of 44 (permalink) Old 07-04-2019, 09:58 PM
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Quote:
I prefer CaCO3 for raising KH, some use potassium carbonate too.
I try to limit excessive potassium and never use a sodium based product such as baking soda.
Quote:
Sodium is not required by plants, why introduce it?
Lots of people use baking soda, I have in the past but no longer.
While most plants don't need sodium some like dwarf hair grass does benefit if some is in the water. Also animals must have some sodium. Some comes from the food but most sodium in aquariums come from tap water. Tap water typically has several milligrams per liter of sodium in it.

Many of the ingredients listed above post can be found on amazon.com, nilocg.com. Just make sure you are getting a pure product without dies, fragrances and other additives.
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