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HW-Marinemix Reefer Salt Mix 160 Gallons

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Trusted by Professionals, Perfected for Your Reef Aquarium!

  • Synthetic Blend for Superior Reef Health
  • Clean and Dissolves Quickly
  • Proven and Trusted Choice for Over 50 Years
  • Makes approx. 160 Gallons of solution at 1.024 specific gravity


Discover the superior quality of hw-Marinemix Reefer Salt Mix, a premium blend crafted with over 50 years of expertise. With its synthetic process and pure formulation, this salt mix guarantees consistency, rapid dissolution, and unmatched cleanliness. Free from unnecessary additives found in other mixes, it meets the rigorous standards set by public aquariums and elite displays. Designed specifically for reef aquariums, it provides essential minerals, trace elements, amino acids, and biocatalysts for robust coral growth. Save time and money with this complete salt mix, eliminating the need for extensive testing and adjustments.


With hw-Marinemix Reefer, achieve optimal calcium, alkalinity, and magnesium levels for your thriving reef ecosystem.

Calcium: ~450ppm*

Alkalinity: ~9 dKH*

Magnesium: ~1380ppm*

*When mixed to 35ppt salinity. Levels are approximate and may differ slightly due to test kit variances.


Mixing Instructions:

By Volume: Add 1/2 cup of Marinemix Salt per 1 gallon of RO/DI water. 

By Weight (Preferred): Add 150 grams of Marinemix Salt per 1 gallon of RO/DI water to achieve 35 ppt salinity.

Let it mix until it is clear and test the salinity of the solution before using. More or less salt may be required, depending on your target salinity level. Always test the salinity level before using in your aquarium.

More Information
UPC 4014246230202
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Product Questions

Do I need to keep this salt heated and circulated 24/7 when storing?
Question by: Tyler on Mar 1, 2024, 4:23 AM
Hey there,
Thank you for reaching out to us. No you would not need to keep the HW-Marinemix Reefer Salt Mix heated or circulated during storage. Please let me know if you need anything further.
Answer by: Thomas Wofle (BRS Staff) on Mar 1, 2024, 11:24 AM
How long can this be stored?
Question by: Laura on Dec 25, 2023, 7:13 PM
Hi there, thanks for reaching out! This can be stored for 4-6 weeks.
Answer by: Grace (BRS Staff) on Jan 26, 2024, 1:31 PM
How much do I use for this 30 gallon tank? I tried to find the direction but nothing for mixing direction per gallon.
Question by: Max McLaughlin on Jun 28, 2016, 2:48 PM
Great question!
Salt mixes typically do not include an exact amount to use rather you will use a refractometer and slowly add salt until you reach 1/026 SG or 35 PPT. Typically you can start with 1/2 cup per gallon and increase from there.
Answer by: Connor on Jun 28, 2016, 5:56 PM
Is this packaged in one bag in the box?
Question by: Steven on Jun 14, 2016, 8:42 PM
Great question!
This will be an individual bag with all of the salt. Feel free to let us know if you have any further questions.
Answer by: Connor on Jun 15, 2016, 10:32 AM
if i use this salt mix will i need supplements?
Question by: johnathan on May 23, 2016, 2:20 PM
Great question! HW is optimized with amino acids and organically stabilized iodine, it contains a proprietary blend of trace elements so there really isn't a need for additives.
Answer by: Carter on May 25, 2016, 3:19 PM
I can't seem to find the composition of the ingredients of this salt. Do you have the list of the ingredients/percentages etc.? Thanks.
Question by: Tariq on May 17, 2016, 8:00 AM
Upon BRS analysis - hw-Marinemix Reefer contained Calcium at 445-450 ppm, Alk of 9.0 dKH, Magnesium at 1380 ppm This is an entire box mixed at a 1.026 SG
Answer by: Connor on May 18, 2016, 6:45 PM
I am currently using tropic marin actif salt mix. If I wanted to switch to this hw-Marine Mix, can I just switch for my next partial water change or do I need to make the transition more gradual?
Question by: Bryan on May 8, 2016, 8:36 AM
the details of this salt state that

BRS recommends using a complete salt mix, to save money and time on testing supplies and major element adjustments. Upon BRS analysis - hw-Marinemix Reefer contained Calcium at 445-450 ppm, Alk of 9.0 dKH, Magnesium at 1380 ppm.

at what salinity was this tested at?
Question by: scott fernandez on Aug 8, 2015, 10:30 PM
Great question, this was tested at 1.026 SG or 35 PPT. Feel free to let us know if you have any further questions!
Answer by: Connor on Aug 10, 2015, 4:41 PM