ATI Fiji white sand keeping high Calcium and Magnesium levels?

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Sorbi

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Hi, has anyone ever experienced constantly high levels of Calcium and Magnesium while using ATI Fiji white sand? It is a nice sand, however, according to the manufacturer:
”Our sand is 99.6% pure calcium and magnesium compounds”.
So I need to dose alkalinity to keep it about 9.3 dKH in a mixed reef tank. Calcium is always about 490-500, Magnesium 1410.

Any experience/idea? Thanks.
 

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I doubt the sand adds any calcium or magnesium to the water.
They also say that it needs to be rinsed several times. If there were any chemicals added then I would think that alone would remove it.
 
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Sorbi

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I doubt the sand adds any calcium or magnesium to the water.
They also say that it needs to be rinsed several times. If there were any chemicals added then I would think that alone would remove it.
Thanks, any other idea why my Calcium and Magnesium keep having high concentration without dosing?
 
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I run the same sand and don't have that problem. Cal 400, mag 1300.
I do believe it did suck most of the phosphate out of the water when I added it to my running tank.
 
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Sorbi

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Thanks for your thoughts. I used 3 different brands of the tests (Salifert, AquaForest, Tropic Marine), all very similar results. Then testef two different reference solutions with the same tests: the results were almost identical to the ones stated on the reference solution. My salt mix (tropic marine pro reef) has lower calcium than the tank. I am really confused with these levels of Ca and Mg
 

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I also use TM pro. Sorry, no idea. New tank?
 
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Backreefing

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I have been having the theory’s about crushed coral gravel and alk , calcium , magnesium numbers . But you haven’t used reef crystals salt mix ? Me and other members have had batches with rediculus high magnesium. I used it because it was available quickly, and regret it.
 
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Sorbi

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I have been having the theory’s about crushed coral gravel and alk , calcium , magnesium numbers . But you haven’t used reef crystals salt mix ? Me and other members have had batches with rediculus high magnesium. I used it because it was available quickly, and regret it.
No, I haven’t used reef crystals mix
 

Randy Holmes-Farley

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Hi, has anyone ever experienced constantly high levels of Calcium and Magnesium while using ATI Fiji white sand? It is a nice sand, however, according to the manufacturer:
”Our sand is 99.6% pure calcium and magnesium compounds”.
So I need to dose alkalinity to keep it about 9.3 dKH in a mixed reef tank. Calcium is always about 490-500, Magnesium 1410.

Any experience/idea? Thanks.
No, it is your salt mix that is doing that.
 

Randy Holmes-Farley

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I run the same sand and don't have that problem. Cal 400, mag 1300.
I do believe it did suck most of the phosphate out of the water when I added it to my running tank.
All calcium carbonate will bind phosphate. It won't release large amounts of calcium or alkalinity (it cannot, and if it somehow did, a rise of 20 ppm calcium will boost alk by 2.8 dKH, which would quickly push alk through the roof for any significant calcium or magnesium boost.
 
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