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Formul8 RSW

Artificial Seawater Blend (Dry): Red Sea Ionic Values (calculated at S=40.1)

Pair Formul8 RSW.bmp

Shown: Reef Blueprint (left) and standard Commercial packaging options.


  • Salinity

  • pH average

  • Alkalinity

  • Chloride

  • Sulfate

  • Sodium

  • Magnesium

  • Calcium

  • Potassium

  • Bromide

  • Strontium

  • Boron

  • Iodide

  • Molybdenum

  • Vanadium

  • Nickel

  • Zinc

  • Manganese

  • Copper

  • Selenium

  • Iron

  • Cobalt



8.35 +/-0.050

9.11 dKH

21,934.01 ppm

3,080.35 ppm

12,246.91 ppm

1,457.89 ppm

467.99 ppm

453.25 ppm

76.35 ppm

9.02 ppm

5.05 ppm

6.332x10-2 ppm

1.196x10-2 ppm

2.267x10-3 ppm

5.443x10-4 ppm

5.669x10-4 ppm

3.402x10-4 ppm

1.134x10-4 ppm

1.521x10-4 ppm

6.236x10-5 ppm

3.402x10-6 ppm


  • Complete artificial seawater salt blend with an ionic composition corresponding to Red Sea values at S=40.1, mixing to a final salinity value of 40.1. 

  • Values of major ions and select minor and trace ions (specifically, those not considered by researchers to be phytotoxic and which exhibit a nutrient-type depth profile in open oceanic waters) correspond to Red Sea average values (S=40.1).

  • Composed of >99% w/w anhydrous materials, with purity not less than that which conforms to FCC grade for major components, and ACS-Reagent grade for minor components.  

  • Due to the purity of components utilized, all Formul8 variants mix to ≥99% clarity of purified water utilized in the seawater preparation.  

  • Ionic consistency between containers generally exceeds 99.5%.  

  • Formul8 blends do not deposit residue on static surfaces, such as mixing vessels and pipes. This also applies to Formul8x blends, assuming that the user employs one of the recommended NaCl products, or NaCl of equivalent purity. 

  • Recommended applications for Formul8 and Formul8x blends are: aquaculture; zoological displays; and scientific research projects demanding the greatest purity of components, homogeneity of blend, and accuracy of ionic values, such as in lab sea surface temperature ​analysis and biotope reproduction.


​Astute observers will notice that the minor and trace elements incorporated into this and the other Formul8 and Formul8x formulations are those which are specifically demonstrated by oceanographic researchers to exhibit nutrient-type depth profiles, and which are not considered phytotoxic at NSW values; this list conforms with our minor and trace element solution, Isol8 MT, which is intended to be dosed into recirculating seawater systems as a means of maintaining NSW values, at the daily rate of 1 mL / 250 gallons, or 1 drop (0.05 mL) per 12.5 gallons.

Lanthanide metals (Lanthanum, Cerium, Praseodymium, Neodymium, Promethium, Samarium, Europium, Gadolinium, Terbium, Dysprosium, Holmium, Erbium, Thulium, Ytterbium, and Lutetium) are not incorporated into these formulations; this decision has been made as a result of the massive body of evidence which shows that these elements, collectively, are phytotoxic in concentrations which are at or below those of their respective NSW values (assuming S=35.0).  Additionally, barium and chromium salts are excluded on grounds of contact toxicity.


Keep out of reach of children and unauthorized persons. Avoid contact with skin, eyes, and mucous membranes. Store in a cool, dry location away from sunlight.

The following discussion and recommendations are made expressly for recirculating systems.  Laboratory application may proceed as required by study objectives.  Review Disclaimer at bottom of page prior to using this or other Captiv8 Aquaculture product(s).

This and other artificial seawater formulations produced by Captiv8 Aquaculture are available with and without bromide.  The standard formulations include bromide.  When present, the bromide concentration will reflect documented values for the water body being replicated.

Refer to instructions printed on container when handling and/or mixing Formul8 blends.

Anchor 1


Notice: It is not possible to eliminate all risks associated with the use, handling, or storage of this product. Ineffectiveness, injury to crops and/or livestock, or other unintended consequences may result due to factors outside the control of Captiv8 Aquaculture or the seller. Buyer or user shall assume all such risks. For details, go to Terms and Conditions. Consult SDS before use.


Disclaimer: Captiv8 Aquaculture warrants that this product conforms to the description, and is reasonably fit for the purposes described, on its label. In no event shall Captiv8 Aquaculture or the seller be held liable for any incidental, consequential, or special damages, loss, or injury, including, without limiting, lost profits, resulting from the use or handling of this product. The exclusive remedy of the buyer or user for all claims shall be the return of the purchase price of this product. Express and implied warranties are disclaimed. Captiv8 Aquaculture does not authorize any agent or representative to make any other warranty, guarantee, or representation concerning this product.

For sale by Captiv8 Aquaculture and its authorized dealers, only.

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