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Marine Salts & Hydrometers

Variety of makes of Marine Salts


Crystal Sea Salt Measuring Cup

Crystal Sea Salt Measuring Cup

Crystal Sea Salt Measuring Cup

1 Level cupful = 4 US Gallons @ 1.023 Specific Gravity (3.3306967 UK Gallons)


Kent Reef Salt Mix

Kent Reef Salt  Mix



Kent Reef Salt Mix is a superior blend of all the components necessary to keep marine life healthy in saltwater aquariums .

It is manufactured in one of the finest facilities in the world, ensuring consistent mixes, batch after batch. The facility contains state of the art dehumidifying equipment, hammermills, pharmaceutical blenders and electronic weighing and bagging equipment providing a superb uniform dry mix.

Most other sea salt brands, however fine, only provide seawater levels of trace minerals. In the wild, animals have cubic miles of seawater from which to draw the minerals that they need. In the enclosed environment of a marine aquarium however, animals often suffer because they quickly use up available minerals.

Kent Reef Salt Mix contains enhanced buffer levels ensuring a stable pH and enhanced levels of important minerlas, such as calcium, strontium, iodine, iron, cobalt, rubidium, lithium and many others providing sustained long term results! It includes Coral Vite technology which provides these minerals plus vitamins for the invertebrates.

Some other newer sea salts are deficient in important minerals such as magnesium, many only containing 50% of saewater level!. This saves them money in the production of their salt, but costs the hobbyist! Low magnesium salts cause problems maintaining calcium and buffer levels. Not Kent! Kent Reef Salt Mix has full seawater level of magnesium as well as the proper levels of all other necessary major, minor and trace minerals.

If you want the finest sea salt : buy Kent Reef Salt Mix!


3.18kg Bag makes up to 25 U.S. Gallons (95 Litres)
6.35kg Bag makes up to 50 U.S. Gallons (189 Litres)

Kent Reef Salt Mix 3.18kg BagAQ015982 £19.89
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Kent Reef Salt Mix 26.3kg BucketAQ015986 £105.99
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Instant Ocean

Instant Ocean
Instant Ocean salt is a complete formula that includes every necessary major, minor and trace element blended to simulate natural seawater.

Only Instant Ocean gives you every nutrient necessary for marine organism growth and development.

The new, improved formula is even faster dissolving than ever.

The largest selling salt in the world.

Instant Ocean 60 litre (2Kg) AQ018255 £10.99
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SeaChem Reef Salt

SeaChem Reef Salt
SeaChem Reef Salt is a chemically sound blend of salts designed to replicate natural reef waters.

It is specifically formulated for the reef environment and will provide ideal seawater concentrations of magnesium, calcium, and strontium with proper alkalinity and pH for closed reef aquarium systems.

It contains all essential major, minor, and trace components found in natural reef waters, but contains no toxic or non-essential components such as nitrate, phosphate, silicate, arsenic, cadmium, or beryllium.

SeaChem Reef Salt dissolves quickly and completely and is ready to use in only a few minutes.

SeaChem Reef Salt will support and promote enhanced calcium and alkalinity stability for those wishing to maintain calcium above Natural Sea Water (NSW) levels (400 mg/L) as well as providing NSW levels of bromide (65 mg/L).

For marine only environments, use SeaChem Marine Salt instead. It is specifically designed to meet the requirements of a marine only (not reef) system.


SeaChem Salinity Salt

SeaChem Salinity Salt is a blend of salts specifically formulated for the reef aquarium that contains all essential major, minor, and trace components found in natural reef waters, but contains no toxic or non-essential components.

Additionally, Salinity™ is the most concentrated salt blend on the market. With a hydration level of <0.5% salinity™ will yield a greater volume of prepared saltwater at a salinity of 35‰ per unit of weight than any other salt mix currently on the market.

SeaChem Salinity Salt is identical to the distribution of anions and cations found in Natural Sea Water (NSW). We have compiled data from all the oceans and seas on the Earth, and have targeted the midpoint of the range for each element.

We guarantee to be within ± 5% of the midpoint. For example, at a salinity of 35‰, for calcium, magnesium, and strontium, we have the following targets and ranges.

Calcium: target 422 mg/L, range 400 to 443 mg/L
Magnesium: target 1336 mg/L, range 1269 to 1403 mg/L
Strontium: target 8.4 mg/L, range 8.0 to 8.8 mg/L

Alkalinity and pH values vary widely over the Earth’s oceans. salinity™ will be within the following ranges:
pH: 8.4 to 8.6
Alkalinity: 3.2 to 3.8 meq/L


Tetra Marine Sea Salt

Tetra Marine Sea Salt
Tetra Marine Sea Salt : Creates Perfect Marine Water

A good quality salt is the key to success with marine aquariums. Tetra Marine Sea Salt is a high quality blend of salts, which replicates the natural conditions found on coral reefs.

Suitable for both fish and corals, Tetra Marine SeaSalt is all you need to create and maintain perfect water. When regular partial water changes are conducted using Tetra Marine SeaSalt, there is usually no need to add supplements to the aquarium, making it easy to keep corals and other invertebrates healthy.

Additionally, Tetra Marine SeaSalt contains no nitrate or phosphate, to help control algae growth and maintain coral health.

Tetra Marine Salt is carefully formulated using the highest quality standards and years of research to create perfect water for the marine aquarium

Free from Nitrates and Phosphates

To achieve approx 1,024 SG use 1kg for every 25 litres of water

Tetra Marine Sea Salt 2kgAQ071300 £10.25
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Tetra Marine Sea Salt 4kgAQ071303 £17.90
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Tetra T604 Marine Sea Salt 8kgAQ071306 £28.60
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Tetra Marine Sea Salt 20kgAQ071309 £61.30
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Tropic Marin

Tropic Marin
Tropic Marin Synthetic Sea Salt

Tropic Marin was first formulated in 1965 and since that time, it has been continuously improved as more precise analytical methods have uncovered the many subtleties of natural sea water. It does not contain any phosphates or nitrates and is manufactured from absolutely pure pharmaceutical grade ingredients, 98% of which are from natural sources.

Using a highly sophisticated process of solid solution mixed crystals, each grain of Tropic Marin contains the exact mix of 70 trace elements found in natural sea water and a unique production process ensures that all these trace elements are maintained in solution, avoiding selective precipitation. Special hydrates are added to ensure super solubility in tap water.

Our packaging is 100% vapour proof which guarantees that no impurities from air or other gases can be absorbed whilst in storage, keeping the salt fresh and lump free.

Tropic Marin Sea Salt is chosen by many of the world's leading public aquariums, professional institutes and hobbyists - it's the natural choice!.

Tropic Marin 60 litres (2Kg)AQ152001 £10.94
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Tropic Marin 120 litres (4Kg)AQ152003 £13.00
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Tropic Marin 300 litres (10Kg)AQ152004 £43.81
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Tropic Marin 750 litres (25Kg)AQ152007 £93.38
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Tropic Marin 900 litres (30Kg)AQ152008 £64.47
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