From (osmosis-) water to seawater. Tropic Marin Sea Salt CLASSIC is made up of all of the macro elements and trace elements in a natural balance, contained within the ocean, and it is free from artificial additives, nitrates and phosphates. The trace elements remain completely soluble in the mixed crystals. Contains appropriate amounts of bicarbonates which stabilize the aquariums alkalinity and pH.

Tropic Marin Sea Salt CLASSIC is an ideal foundation for the care and growth of all marine organisms in an aquarium. Use seawater prepared with Tropic Marin Sea Salt CLASSIC for regular water changes in your seawater aquarium, to start a new aquarium and to re-equilibrate the pH of a tank.

Benefits:

How to use:

To achieve a salinity level of 32-35 ‰ (psu), dissolve 35 ml of Tropic Marin^® Sea Salt CLASSIC per liter or approximately ½ cup of Tropic Marin Sea Salt CLASSIC per US gallon water. Dissolve almost all of the salt in a clean container already filled with the full volume of RO/DI water at a temperature of 73-77 °F / 23-25 °C while circulating/stirring the water. Do not concentrate the mixture by adding the full amount of salt to a smaller amount of water.

Note: Always add the salt to the water, never the water to the salt. Making a concentrated mixture will cause a calcium carbonate precipitate to form.

When you have added ALMOST all of the salt and the mixture is fully dissolved and clear, start measuring the specific gravity with a hydrometer or similar instrument. Keep adding small amounts of salt until the specific gravity is the value you desire. The specific gravity of the sea salt solution should range from 1.025 to 1.027 (at 73-77 °F / 23-25 °C) and the pH -value should be in the range of 8.0 – 8.4. If all parameters ​​are correct, the salt water is ready to use.

After setting up a new aquarium it takes a few weeks of water being circulated and correct lighting conditions to achieve the biologically stable environment required for the care and breeding of delicate marine organisms.

A weekly, partial water change, replacing 10 % of the total water volume with Tropic Marin Sea Salt CLASSIC , will help to maintain the water quality that your livestock needs for good health.

Parameters: approx. 9-10° KH, calcium approx. 380 ppm, magnesium approx. 1260 ppm

Application: For fish only tanks and reef tanks with soft corals with no special requirements. To maintain the alkalinity in a 9-10 °dH range.

Use the new dosing calculator for an easy determination of the required amount of salt for your aquarium.

Freshness & Storage

Every batch we dispatch carries a minimum of 6 months’ remaining shelf life. Store this product in a cool, dry place away from direct sunlight, with the cap or inner foil closed tightly after each use.

Filter media and substrates carry no manufacturing or expiry date — their working life begins on first contact with water, not on the shelf.

Returns & Replacement

Returns are accepted within 7 days of delivery, provided the item is unused and in its original packaging. Manufacturer-sealed items cannot be returned once the seal is broken, and sale-priced items are not refundable.

If your item arrives defective or damaged, message us on WhatsApp with your order number — or email us, if you would rather — and we will replace it. Approved replacements are delivered within 3 to 5 business days. Transit damage is covered by insurance on every shipment. If tracking shows delivered but nothing reached you, tell us within 72 hours, which is the reporting window Indian couriers allow. Damage caused during installation or use is not covered; replacement spares for such cases are chargeable.

Full terms are on our Cancellation & Returns page.