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Calcium source for dwc that doesn't have nitrogen
- Thread starter bobbyjaxx
- Start date
Ibechillin
Masochist Educator
Calcium Sulfate dihydrate is water soluble, here is a link to solution grade 22% calcium and 17% sulfur 50lb bag for $11.25 before shipping:
https://customhydronutrients.com/calcium-sulfate-dihydrate-solution-grade-gypsum-50-bag-p-886.html?cPath=134_135_276&zenid=9553f404bfeae80398701c63ab96661f
https://customhydronutrients.com/calcium-sulfate-dihydrate-solution-grade-gypsum-50-bag-p-886.html?cPath=134_135_276&zenid=9553f404bfeae80398701c63ab96661f
troutman
Seed Whore
For calcium, I'm now using CaribSea Aragonite Aquarium Reef Sand I purchased from a pet store.
They use it for saltwater aquariums and I'm not running my aquarium now. So why not use it.
Aragonite is the most soluble form of calcium carbonate. It doesn't have nitrogen or phosphorus.
Outdoors, I normally just use less expensive Dolomitic Limestone purchased from a garden center.
They use it for saltwater aquariums and I'm not running my aquarium now. So why not use it.
Aragonite is the most soluble form of calcium carbonate. It doesn't have nitrogen or phosphorus.
Outdoors, I normally just use less expensive Dolomitic Limestone purchased from a garden center.
I think this will end up settling to the bottom, no?
Ibechillin
Masochist Educator
Lot of good info on gypsum and calcium availability in this thread: (much more availability to plant with aminos added, info is in thread)https://www.icmag.com/ic/showthread.php?t=357679
Oops also Ca Acetate which has high solubility. It's food grade so can be hard to source and a tad pricy.
CrushnYuba
Well-known member
Calcium chloride.. But I'm not into chloride.
I have never had an issue with calcium nitrate. I just adjust for it. Straight bloom booster and calcium nitrate is still to low in N
I have never had an issue with calcium nitrate. I just adjust for it. Straight bloom booster and calcium nitrate is still to low in N
Jack El Frutero
Member
Really?
Calcium sulfate dihydrate
Water solubility 0.2 % at 77° F (NIOSH, 2016)
Solubility in water, g/100ml at 25°C: 0.24 (very poor)
Solubility in water, g/100ml at 20°C: 0.2 (very poor)
(77°F): 0.2%
https://pubchem.ncbi.nlm.nih.gov/compound/Calcium_sulfate_dihydrate#section=Top
Ibechillin
Masochist Educator
ACG Materials brand of Calcium Sulfate, is a high purity, fine, soft white dihydrate form of gypsum with a specific gravity of 2.32, a typical pH of 7.5. Typical average particle diameter of ACG Valu-Fil is 18 microns. Maximum solubility 2 grams per liter or 7.7 grams per gallon.
Can not be used in concentrated stock solutions.
Can not be used in concentrated stock solutions.
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Jack El Frutero
Member
I don't know about "all gypsum", and I did not even mentioned "gypsium", but solubility of Calcium Sulfate Dihydrate in water is ~0.2% at room temperature. That's a fact.
Jack El Frutero
Member
I have a news for you: 2 grams per liter is exactly 0.2%.
Jack El Frutero
Member
It's funny to read smbdy claiming 100% solubility of calcium sulfate in water, when actual number is about 0.2%.
Yeah, it must be very special type of CaSO4, from another Universe, I guess.
Yeah, it must be very special type of CaSO4, from another Universe, I guess.
Ibechillin
Masochist Educator
What were you hoping to accomplish in post#11 when you said^ quoting me saying its "water soluble" not "completely soluble"?
calcium sulfate is gypsum.
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Jack El Frutero
Member
I was hoping to let readers know that Calcium Suifate is only soluble in water at the rate of 0.2% at room temperature.
In general day-to-day use the term "water soluble" implies "completely soluble", so I think it should be mentined that solubility of the salt is really low, that's it. No reason for you to be defensive.
Jack El Frutero
Member
I should've quoted this from your post, as it looks like you were quoting OO in full agreement:
Quote:
Originally Posted by Only Ornamental
Pure calcium sulfate dihydrate is indeed fully water soluble
Quote:
Originally Posted by Only Ornamental
Pure calcium sulfate dihydrate is indeed fully water soluble
Yeah it does seem to me that there are far better options for hydroponic solutions than calcium sulfate. I guess its really a case of how much you require in solution and what else is in that solution at what concentration. So if you only required say 1/4 gram per litre of gypsum perhaps its all right but you have to allow for common ion problems etc. Better yet use something like Ca EDTA or Ca Acetate or even Ca Cl (as long as a bit of Cl is acceptable) rather than chance it with gypsum. Fact is no hydro nutrient manufacturer would go anywhere near gypsum and gypsum while being fine in soils (and widely used)isn't the best option for hydro. Lot of attitude getting around but how does that help the person who asked the original question. It's not a competition.
troutman
Seed Whore
CaCl2 = road salt. Don't use that.
Calcium acetate is easy to make if you don't have any.
Calcium carbonate + vinegar = calcium acetate + carbon dioxide + water
