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Red Sea Coral Pro Salt - 55 Gallon Bucket


Item #: RS4211

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Red Sea Coral Pro Salt is a specialty salt mix formulated for today’s advanced reef aquariums. A scientifically formulated marine salt is based on using pure water. This is a necessary to accurately calculate all the elements required to recreate tropical seawater. It is the best way to create a baseline salt formulation that most precisely mirrors the reef environment.

Research laboratories and professional aquaculture facilities often use ultra-pure reverse osmosis and deionized mineral-free water for mixing saltwater. Reef aquarists using RO or RO/DI can have this same level of “saltwater perfection” with Red Sea Coral Pro Salt.

Coral Pro Salt is intended to stimulate growth of SPS and LPS corals in aquariums and frag tanks. The coral-building process of calcification demands adequate levels of Foundation Elements: calcium, magnesium and bio-available carbonates. These elements play a key role in coral metabolism and growth, pH stabilization and ionic strength of the saltwater. Coral Pro Salt contains the levels of foundation elements and trace elements necessary for coral growth in your aquarium.

You won’t have to use additives to “fix” your freshly made saltwater!

Here’s what we really like about Red Sea Coral Pro Salt:

  • Accurately formulated for use with RO/DI water
  • Can also be used with soft water
  • pH stabilizes between 8.2 – 8.5
  • No phosphate or nitrate contamination
  • No need to immediately add extra calcium, magnesium or carbonates

Red Sea Coral Pro Salt Mix Features:

  • Long-term testing proves captive corals demonstrate vigorous growth and vibrant colors
  • Formulated specifically for the advanced reef aquarist using purified water
  • Provides the extra foundation elements needed to promote coral growth
  • Proper pH level quickly stabilizes after mixing
  • Manufactured in small batches to ensure all elements are evenly blended throughout the salt mix
  • Contains all trace elements needed for fish and invertebrates

The recommended salinity level for reef-building corals is approximately 35 parts per thousand (ppt). At 35 ppt, Red Sea Coral Pro Salt supplies 480 ppm of calcium; the same calcium level required for growing LPS and SPS corals in reef aquariums.

The following table shows calcium levels of Coral Pro Salt mixed in RO water for various salinities at 75°F (24°C).

Specific gravity Salinity Calcium Quantity of Salt Mix
1.021 30.6 ppt 420 ppm 33.4 g/l 1.4 lb/5 US gal
1.023 32.8 ppt 450 ppm 35.8 g/l1.5 lb/5 US gal
1.025 35.0 ppt 480 ppm 38.2 g/l1.6 lb/5 US gal

If you have a marine fish and invertebrate, SPS dominant, or ultra-low nutrient system, consider the standard Red Sea Salt Mix formulation.

Red Sea Reef Care Recipes offer easy-to-understand and simple-to-implement instructions for reef maintenance, tailored to each type of aquarium. 3 easy steps for maintaining your reef aquarium. Water changes | Supplementing | Testing.

Select the system type that best describes your reef. The Reef Care Recipe will outline the ideal water parameters for your system, how to maintain them and what products to use.

WARNING as required by state law: This product can expose you to chemicals, including Lithium carbonate and cobalt sulfate, which is known to the State of California to cause cancer and birth defects and other reproductive harm.For more information go to http://www.P65Warnings.ca.gov

Manufacturer information

With a dedicated team of scientists and other professionals, Red Sea is widely recognized as a leading innovator and manufacturer of quality products for aquarium hobbyists. Red Sea constantly strives to provide hobbyists of all levels with highly effective solution-driven products designed to make your fish-keeping experience as enjoyable and successful as possible.

The embodiment of Red Sea’s dedication to providing solutions for today’s reef-keepers is its range of MAX-NANO, MAX-E & MAX-S aquariums- The only choice for true Plug & Play™ coral reef aquariums, now featuring the very latest in LED lighting technology.

For advanced reef-keepers the Red Sea REEFER provides a great platform into which you can add your own selection of hardware. With its ultra-clear glass, ATO built-in, silent flow valve and superb quality of finish the REEFER sets the standard for those wishing to customize. REEFER is also available as a Deluxe version with LED lighting included.

Red Sea’s unique Reef Care Program (RCP) provides a comprehensive, safe and easy to use program for testing and supplementing within reef aquaria, and is perfectly complemented by Red Sea’s Coral Pro & Red Sea Salt’s, which has become the salt of choice for those seeking the very highest quality water quality for their coral reef aquariums. Both salts are made using a unique natural process which delivers unrivalled homogeneity and is perfect for delicate corals. Check your individual bucket of salt’s composition using Red Sea’s innovative new “MyBatch” software.

Whatever your aquatic needs, Red Sea delivers high quality innovative, solution based products.

5 Stars


Reviewed on
February 16, 2021

Yes, I would recommend this.

My favorite salt

Pros: Mixes clear quickly, consistent parameters

Red Sea Coral Pro is my favorite salt to use for my reef tank. The elevated levels in the salt makes it easier to maintain ideal alkalinity, calcium, and magnesium. Marine Depot has the best price and quick shipping.

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Reviewed on
February 02, 2021

Yes, I would recommend this.

A perfect fit!

Pros: slightly better value. No plastic waste

Cons: none

I have been buying RedSea Pro Salt for years, the # of empty buckets are a testament to that. I wasn't sure if I would like the new size until I bought one a couple of weeks ago. To my surprise I was able to take the bag out of the box and work it into a freshly empty screw top Pro bucket. It fit with no room to spare. Same great salt, no wasteful plastic bucket!

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Reviewed on
November 18, 2020

Yes, I would recommend this.


Pros: Quick dissolving.

Been using this salt forever without any problem. 1/2 cup for 1 gallon of water always gave me same salinity reading.

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Reviewed on
September 06, 2020

Yes, I would recommend this.

Great salt, but beware of high alkalinity...

Pros: Mixes clear within 15-20 minutes, no clouding, no residue

Cons: High alkalinity can be difficult to maintain

This is a great salt mix. It mixes clear within 15-20 minutes. I've never seen it cloud even after 2+ hours of aeration with a return pump and I've never had any leftover residue in my mixing containers.

The only thing I would be aware of is the elevated levels of alkalinity in this salt. Most salt mixes are between 7-9 dKH, but this salt mixes at 10-12 dKH. The higher alkalinity is great for accelerated coral growth, but you need to be prepared to maintain those elevated levels with consistent dosing. I failed to be consistent with my dosing and lost all but one of my SPS corals. Once I started losing corals, I started testing alkalinity daily and noticed swings between 8 and 11 dKH over the course of a few days. I have since switched to the regular Red Sea salt which mixes between 7-8 dKH and has been much easier to maintain consistency.

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Reviewed on
August 20, 2020

Yes, I would recommend this.

Best Salt Around 10/10

Pros: Trace elements, $$$ off after continuous purchases

Cons: Price

This salt has everything you need to keep a reef tank. I do 25% water changes every week on my 13.5 gallon and I never have to supplement for any trace elements, etc. I do feed corals red sea coral super food but that's it. Tank also has two clownfish.

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Reviewed on
July 30, 2020

Yes, I would recommend this.

Great salt for high alk

If you're looking to run a high alkalinity aquarium this salt works very well. Composition seems to be consistant from one bucket to the next. As with all salt be sure to mix the salt around in the bucket before use.

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Reviewed on
July 12, 2020

Yes, I would recommend this.

Mixing is easy

Pros: Easy to use

Cons: None

Half cup per gal of RO

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Reviewed on
July 03, 2020

Yes, I would recommend this.

Quality product

Pros: I like that inside the bucket the salt is also inside a bag.

Cons: None

This is a good quality product at a reasonable price.

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Reviewed on
June 23, 2020

Yes, I would recommend this.

Great salt

Pros: Great for reef tanks

Cons: none

great salt mix for the money.

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Reviewed on
June 22, 2020

Yes, I would recommend this.

Salt is great, shipping service/packaging, not so much.

Pros: Great salt

Cons: Comes with a broken bucket many times.

That product itself is great, I've been using it for some time now. Every time I seem to order it however, the bucket is busted when it arrives. I understand that this isn't Marine Depot's fault rather that the shippers negligence.

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