Raising tds - The Planted Tank Forum
 
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post #1 of 9 (permalink) Old 09-21-2014, 09:49 PM Thread Starter
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I have very soft water with low TDs and wish to raise TDs and hardness. I have calcium-chloride and magnesium sulfate. I want to raise the ppm of the water by about 300-400ppm with a end solution of approximately equal parts calcium and magnesium. I do not have probes to read the ppm so am looking for someone who can help figure out a measure oh how much per gallon would be needed of dry salts.
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post #2 of 9 (permalink) Old 09-21-2014, 11:22 PM
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Calcium Nitrate (CaNO3)- $2.50/lb
Calcium Sulfate (CaSO4)- $3/lb
GH Booster- Contains 3:3:1(K2SO4:CaSO4:MgSO4)- $6/lb
I coppied part of a list so that you could see my source for this info was not just a guess. The normal ratio of CaSO4 to MGSO4 is usually not 1/1.
I have heard it used 5/1 but was told by someone on here in a PM on that subject
that they believe four to one is correct and so that is what I now use.
I use it for the plants AND the shrimp and it raises my TDS at the same time without adding more Potassium which you can see is added to GH booster.
BTW they use(and I also) calcium sulfate and not calcium chloride.
I do not know how much difference that makes but sodium chloride is salt and if there is any connection in there it would make a lot of difference.

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post #3 of 9 (permalink) Old 09-22-2014, 12:07 AM Thread Starter
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No calcium chloride is nothing like sodium chloride. It is more soluble than other forms thus giving higher calcium content per amount used. I am not using it for plants it is for fish I am trying to mimic hard water with what's at hand and cheap.

Calcium sulfate is hard to dissolve completely into water.

Last edited by Darkblade48; 09-22-2014 at 03:00 AM. Reason: Please use the edit function for back to back posts to keep threads cleaner
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post #4 of 9 (permalink) Old 09-22-2014, 02:37 AM
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Smile Certainly Raising TDS...

Seems like a lot but, assuming the CaCl2 is the hexahydrate ad 1.5-teaspoons (5.5-g) per gallon and will yield around 270-ppm Ca2+. Assuming the MgSO4 is the hexahydrate (Epsom salt) adding 0.5-teaspoon (2.5-g) per gallon will yield about 65-ppm Mg2+. The general hardness will increase by 942-ppm as CaCO3, or 53-dGH. That is very hard water it also might precipitate the carbonate hardness.

The reason I presented the increased hardness as 3-parts Ca2+ to 1-part Mg2+ is the laxative risk to the fish. This much increase in hardness should be done over the course of a week or two.

You are also adding 470-ppm Cl- and 257-ppm SO42-.

This addition alone places you at 1062-ppm TDS, increases the osmotic pressure 58.3-kPa (0.583-bar) at 25C (77F).

You are now calculating TDS in part-per-thousand (ppt), a range generally reserved for brackish water.

Joe
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Last edited by JoeRoun; 09-22-2014 at 02:39 AM. Reason: presure
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post #5 of 9 (permalink) Old 09-22-2014, 03:08 AM Thread Starter
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No my CaCl2 is dihydrate not hexahydrate.

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post #6 of 9 (permalink) Old 09-22-2014, 03:48 AM Thread Starter
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As stated I am only trying to raise my ppm by 300-400.

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post #7 of 9 (permalink) Old 09-22-2014, 05:45 AM
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Check out http://rota.la/. You can calculate out how much dihydrate CaCl2 and MgSO4 is needed to raise a volume of water by a certain PPM.

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post #8 of 9 (permalink) Old 09-22-2014, 07:26 AM
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Red face Opps

Using 3.7-grams Calcium chloride dehydrate is about the same as using 5.5-grams of Calcium chloride hexahydrate.

All the information remains the same.

Raising TDS by 300 or 400-ppm makes more sense, my apologies.

1.5-g CaCl2*2H2O and 0.5-g MgSO4*7H2O adds about 365-ppm TDS.

While adding 81-ppm Ca2+ and 13-ppm Mg2+. Adding 258-ppm as CaCO3 or 14.5dGH

Much more reasonable.

Joe
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post #9 of 9 (permalink) Old 09-22-2014, 04:56 PM Thread Starter
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Quote:
Originally Posted by JoeRoun View Post
Using 3.7-grams Calcium chloride dehydrate is about the same as using 5.5-grams of Calcium chloride hexahydrate.

All the information remains the same.

Raising TDS by 300 or 400-ppm makes more sense, my apologies.

1.5-g CaCl2*2H2O and 0.5-g MgSO4*7H2O adds about 365-ppm TDS.

While adding 81-ppm Ca2+ and 13-ppm Mg2+. Adding 258-ppm as CaCO3 or 14.5dGH

Much more reasonable.

Joe
FBTB
Thank you for your help. My fish will appreciate it greatly.

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