PPS Pro fert solution replace potassium nitrate with calcium nitrate? - The Planted Tank Forum
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post #1 of 46 (permalink) Old 02-06-2014, 12:44 PM Thread Starter
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PPS Pro fert solution replace potassium nitrate with calcium nitrate?

Hi,

I'm unable to get potassium nitrate where I live, but I have calcium nitrate on hand.

Just wondering how many grams of calcium nitrate I should add to a PPS Pro solution.

Thanks
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post #2 of 46 (permalink) Old 02-06-2014, 01:10 PM
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Why don't you order them online??? There are even sellers in this forrum.

Anyway, plants need potassium, more so then calcium. It's like saying I don't have fresh water, I only have salt water. How many cups of salt water should I drink a day?

Last edited by Darkblade48; 02-07-2014 at 01:30 AM. Reason: Back to back posts
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post #3 of 46 (permalink) Old 02-06-2014, 01:45 PM Thread Starter
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It's illegal in my country to buy/sell it or import it unless you have a license
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post #4 of 46 (permalink) Old 02-06-2014, 02:40 PM
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You can use calcium nitrate if you wish, but note that the effective dose of nitrates will be double that of potassium nitrate.

In addition, note that you will be increasing your GH by dosing calcium nitrate.

Anthony


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post #5 of 46 (permalink) Old 02-06-2014, 02:59 PM Thread Starter
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Thanks! My tap water is very soft, so it wouldn't hurt to bring up the GH a bit, I think. I suppose then that adding 32.5 g (as opposed to 65 g of potassium nitrate) will give the equivalent dose of nitrate?
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post #6 of 46 (permalink) Old 02-07-2014, 01:31 AM
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Originally Posted by poissonej View Post
I suppose then that adding 32.5 g (as opposed to 65 g of potassium nitrate) will give the equivalent dose of nitrate?
No. You have to account for the different molecular weights of potassium and calcium.

Anthony


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post #7 of 46 (permalink) Old 02-07-2014, 04:01 PM
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500mg of Ca(no3)2.4H20 will raise 10g of water ~7ppm no3
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post #8 of 46 (permalink) Old 02-08-2014, 02:52 AM
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just a heads up, cano3 will react with any SO4 in the solution. if you want i can give you a recipe which creates KNO3 by reacting CANO3 and K2SO4.

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post #9 of 46 (permalink) Old 02-08-2014, 07:16 AM
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just a heads up, cano3 will react with any SO4 in the solution. if you want i can give you a recipe which creates KNO3 by reacting CANO3 and K2SO4.
Simple single displacement reaction, but why would you want to waste the potassium sulfate in that way?

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post #10 of 46 (permalink) Old 02-08-2014, 09:51 AM
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Quote:
Originally Posted by Darkblade48 View Post
Simple single displacement reaction, but why would you want to waste the potassium sulfate in that way?
actually nothing really goes to waste beside so4 will fall from the solution, so4 isn't needed in big amounts anyway, you will be left behind with KNO3 in the solution with whatever K+ levels you choose.

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post #11 of 46 (permalink) Old 02-08-2014, 01:57 PM
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actually nothing really goes to waste beside so4 will fall from the solution, so4 isn't needed in big amounts anyway, you will be left behind with KNO3 in the solution with whatever K+ levels you choose.
Well, the calcium sulfate precipitates out, as it is relatively insoluble (though compared to other calcium salts, quite soluble), so there is quite a bit of waste.

Sulfur is considered a macronutrient for plants, but in general, not much emphasis is placed on it because it is generally abundant.

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post #12 of 46 (permalink) Old 02-08-2014, 07:16 PM
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And the OP said the GH was on the low side, anyway, so the added Ca is good in this case.
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post #13 of 46 (permalink) Old 02-08-2014, 07:32 PM
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Originally Posted by happi View Post
just a heads up, cano3 will react with any SO4 in the solution. if you want i can give you a recipe which creates KNO3 by reacting CANO3 and K2SO4.
You can list that recipe. I've never heard of doing that. Some countries allow calcium nitrate but not potassium nitrate. Besides it's just a neat thing to know even though I will probably never need it lol
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post #14 of 46 (permalink) Old 02-08-2014, 07:39 PM
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You can list that recipe. I've never heard of doing that. Some countries allow calcium nitrate but not potassium nitrate. Besides it's just a neat thing to know even though I will probably never need it lol
Ca(NO3)2 + K2SO4 --> 2KNO3 + CaSO4

1 mole of calcium nitrate and potassium sulfate generates 1 mole of calcium sulfate and 2 moles of potassium nitrate.

From there, it's a simple exercise to work out the masses of each required.

Anthony


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post #15 of 46 (permalink) Old 02-08-2014, 08:26 PM
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OP is from SG, which bans KNO3 sales. Dr Mallick's (in SG)use to carry it, not sure if he still does.

Hence the idea of using Ca(NO3)2.

SG's tap is rather nice and pure, but many do not add GH and still quite well.
Adding a GH booster will not hurt.

Since you are adding Ca(NO3)2 to the water and K2SO4 to the water, why does it not also precipitate in the aquarium?




Regards,
Tom Barr
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calcium nitrate, potassium nitrate, pps pro, pps pro fert

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