2 Part Magnesium Mix Aquarium Supplement

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2 Part Magnesium Mix
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  • 2 Part Magnesium Mix

2 Part Magnesium Mix Aquarium Supplement

94% Recommend this to a friend (17 of 18)

SKU: 000316

reg. $10.99

Special Price: $9.34

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Quick Overview

Why does BRS recommend this?

The Pre-Portioned 2 Part Magnesium Mix is one of the easiest ways to supplement magnesium for 2 part dosing.  The mixing of 5 cups Magnesium Chloride to 3 cups Magnesium Sulfate is already done for you keeping your measuring cups in the kitchen and virtually no mess.

Simply just cut the corner of the bag, and pour into a 1 gallon container.  Then top the container off with RODI water and let dissolve for 24 hours prior to use.

Tip: Maintaining proper magnesium levels will help prevent calcium and alkalinity from precipitating which makes maintaining these levels easier as well.


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Product Questions

Once mixed and stored air tight-what's the shelf life?

What's the shelf life of the sealed mix?

Found a gallon container in storage and some misc mix sealed up from a couple years ago so just wanting to confirm.

Question by: William on Nov 16, 2013 10:47:00 AM
Hey William,
Short of something contaminating it, it will basically last until the end of time :-) The magnesium(s) in particular are very hygroscopic though so don't be surprised if it has turned hard (or slushy depending on which product you have). Thats nothing to worry about though.
Answer by: Bulk Reef Supply on Nov 16, 2013 10:47:00 AM

Full Details

One bag mixes with water to create a gallon of solution.

This mix of magnesium chloride and sulfate is designed to be used in conjunction with the two part dosing system as part of standard parameter maintenance.

Maintaining proper magnesium levels will help prevent calcium and alkalinity from precipitating which makes maintaining these levels easier as well.



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  • Have used for years By Juken on 11/25/2015

    Keeps my MAG at a constant 350 with a doser
  • Hard to Mix By DAVID on 9/18/2015

    This one is Much more hard to mix.i had to shake the hell out of the jug and still had to place it in the sink with hot. I have noticed that mixing the Magnesium Chloride and sulfate dissolves much more quicker. I rather measure the two and have it dissolve faster.
  • Great product By Jaxs on 6/1/2015

    Does the job
  • Excellent Product By David on 4/22/2015

    Being new to Reef tanks, finding a magnesium supplement and dosing it correctly can be a little daunting. I found this mix on the site and ordered. Its literally dump it in a 1 gallon container, fill with water, shake and let set for a day, its that easy. Then use the calculator input a few numbers to find out your dosing, then your done. And the icing on the cake is its cheap! Highly recommended item!
  • Great stuff By Huff on 4/21/2015

    I like to just dump this in and not have to worry about measuring. It's always purer than any other mag supplement I have used. I don't have any black particulates at the bottom of my clear jugs.
  • Great product By kyle on 4/19/2015

    You can't go wrong with this product.
  • Great product. Better than others I have tried. By Jonathan on 4/13/2015

    The BRS version of this requires some mixing but compared to others I have tried it is a breeze.
  • Great Product. By Kenny on 3/1/2015

    Have used for 4+ years, like all BRS products it's of the highest quality. i like the prepackaged best simply for ease of use. As long as they sell it I'll continue using it.
  • Love It By htfn on 2/21/2015

    I've using this since 1.5yrs ago and I can't use other one. Love this product. Thanks BRS
  • Great Idea from BRS on this one By Tyler on 2/4/2015

    After buying the magnesium chloride and sulfate separately for years and always running out of the Mag Chloride due to the ration, this seemed like the better option and it is. No measuring, just add to jug and mix. A++++ idea on this one BRS!!!
  • Easy to mix By Jim on 1/17/2015

    Having used the separate mag sulfate and mag chloride mixes in the past, this pre-mixed product is definitely more user-friendly. While the price is higher, the ease of use and convenience is worth it.
  • Have Used for Four Years By LVR on 1/10/2015

    BRS two part works at a good price. We have used it for four years. Always constant and reliable.

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