5 Things to Know Before Buying Magnesium Chloride 99% Flakes

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Lousybreed

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I want to buy MgCl USP in 50 lb bags...I seem to not be able to find it easily online.....is BRS' USP Mag Chloride the best deal out there? I would assume you could do better if you went direct.....

Randy Holmes-Farley

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I've not actually seen magnesium chloride USP for general sale to hobbyists in large sizes like that. OP OP

Lousybreed

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I am going to contact Hydrite a Milwaukee based chemical company on pricing. I might have to go this way because I cannot find anything on the Internet.

Saltyreef

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Not usp but heres a couple bags of deadsea works 99% pure.

This item is unavailable - Etsy

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Willy315

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I am going to contact Hydrite a Milwaukee based chemical company on pricing. I might have to go this way because I cannot find anything on the Inte

Site One Landscape has Mag Pellets but its out of stock. You may call them to see when it is expected to be in stock.

MAG PELLETS

Randy Holmes-Farley

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Not usp but heres a couple bags of deadsea works 99% pure.

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That is what I recommended in my original DIY article. At the time it was about $5 from Home Depot. lol OP OP

Lousybreed

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I will look into it....hoping HD might still have it.

Randy Holmes-Farley

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I will look into it....hoping HD might still have it.

Was more than 20 years ago when I found it. lol

Saltyreef

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They likely dont.
I use a product from HD called safe step and it says 100% pure mag chloride hexahydrate.
Yet when disolved in water does not appear crystal clear but rather a tint of yellow/brown.
Cant find anything in the sds that says otherwise. OP OP

Lousybreed

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I just bought some of that ....I am going to make a solution and send it in for ICP

Randy Holmes-Farley

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I just bought some of that ....I am going to make a solution and send it in for ICP

Great, let us know what you find.

Be a little cautious interpreting the results if you send it to a hobby ICP company as they have optimized the process for seawater, which this is now very different.

I'd recommend making it to about 70 g/L, since that will be close to the 35 ppt of seawater.

Saltyreef

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I just bought some of that ....I am going to make a solution and send it in for ICP

Nice.
I havent emailed this company yet but snow joe confirmed their red label flakes are 100% pure calcium chloride with no added impurities.
This safestep is the only thing i have that doesnt mix 100% clear and needs to be decanted after 24h which i dont like....

Randy Holmes-Farley

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Nice.
I havent emailed this company yet but snow joe confirmed their red label flakes are 100% pure calcium chloride with no added impurities.
This safestep is the only thing i have that doesnt mix 100% clear and needs to be decanted after 24h which i dont like....

I would just caution that 100% calcium chloride only means they do not add any other ingredients, not that the product is free of impurities that might really be substantial.

Saltyreef

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I would just caution that 100% calcium chloride only means they do not add any other ingredients, not that the product is free of impurities that might really be substantial.

I may have mis-spoke.
Their label reads 94% calcium chloride
And their sds lists 100% calcium chloride by weight, 94% pure.
I believe the rest is just water.

Heres the .

Randy Holmes-Farley

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Just don't misunderstand my point. Calcium chloride always has many impurities in it. The question is just one of how much of what.

Saltyreef

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Just don't misunderstand my point. Calcium chloride always has many impurities in it. The question is just one of how much of what.

I gotcha.
I would assume they just dont divulge the other 5-6%?
I guess were just hoping its water?

I just saw an add for dowflake, listed as minimum 99% pure. But the bag clearly says 83 to 87% pure....
What to believe.......hmmmm

Randy Holmes-Farley

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I gotcha.
I would assume they just dont divulge the other 5-6%?
I guess were just hoping its water?

I just saw an add for dowflake, listed as minimum 99% pure. But the bag clearly says 83 to 87% pure....
What to believe.......hmmmm

Most calcium chloride is the dihydrate, which is about 77% calcium chloride and the remainder water, plus lots of other impurities. Some of these other impurities are present at large percentages, but are not a problem. Like potassium.

i analyzed several products long ago:

Aquarium Chemistry: Purity Of Calcium Chloride

Randy takes a look at a number of sources of calcium chloride and reports on them.

Saltyreef

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Most calcium chloride is the dihydrate, which is about 77% calcium chloride and the remainder water, plus lots of other impurities. Some of these other impurities are present at large percentages, but are not a problem. Like potassium.

i analyzed several products long ago:

Aquarium Chemistry: Purity Of Calcium Chloride

Randy takes a look at a number of sources of calcium chloride and reports on them.

Gotcha.
I think i forgot about anahydrous vs dihydrate too lol.
Used to use damprid (dihydrate) now snowjoe(anahydrous)

I actually found sds with the actual makeup of each.
Which if these would you rather use from a chemical standpoint?

Looks like the damprid has less things to cause an issue.

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OP OP

Lousybreed

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Randy your analysis is what i was expecting.......and for me i see no red flags. Most of these chemicals are part of what the reef tank needs anyways. With minimal bad heavy metals I don't see much risk. I am pretty excited to analyze the mag chloride and the calcium chloride to see what impurities are present in my bags.