CaSO4.1 or CaSO4.2? - The Planted Tank Forum
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post #1 of 4 (permalink) Old 03-23-2019, 06:55 PM Thread Starter
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CaSO4.1 or CaSO4.2?

Bought some calcium sulfate, and rotalabutterfly has 2 different ones with one being 2 tsp's apart. Which one do I pick?
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post #2 of 4 (permalink) Old 03-23-2019, 11:42 PM
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Hi @Igor95,

Where did you purchase the Calcium Sulfate from?

Plaster is CaSO4 * 1/2 H2O
Gypsum is CaSO4 * 2 H2O

I just checked: GLA, nilocG.com, and Aquariumfertilizer.com all use CaSO4 * 2H2O
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75 Gallon, 2X55W AH Supply CF 8800K, 1XFluval F&P 2.0; 45 Gallon Tall, 96Watt AH Supply CF 6700K; 30 Gallon Long; Fluval F&P 2.0; 20 Gallon, 1X26W AH Supply LED; all with CO2 and (Calcined) Montmorillonite Clay

Last edited by Seattle_Aquarist; 03-23-2019 at 11:50 PM. Reason: ..
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post #3 of 4 (permalink) Old 03-24-2019, 12:36 AM Thread Starter
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Hey Roy, I purchased it from GLA, thanks!
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post #4 of 4 (permalink) Old 03-24-2019, 01:15 AM
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Yeah. The one with .2H2O is gypsum, the more common mineral form. The one with .1/2 H2O is anhydrite, less common but still found in nature.

Just because, here's a gypsum mine not far from my home.



Rosario, New Mexico. There are several gypsum mines in my area. All exploit the Todilto Formation, which geologists think was a shallow arm of the sea 160 million years ago.

Both gypsum and anhydrite can be used in aquaria, though they dissolve slowly. The only real difference is that anhydrite has a somewhat higher fraction of calcium than gypsum.
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