Red Sea Salt (Blue Bucket)
Red Sea Salt (Blue Bucket)
Red Sea Salt – Premium Reef & Marine Aquarium Salt Mix (Blue Bucket)
Balanced salt mix for stable reef and marine aquariums.
Red Sea Salt (Blue Bucket) is a high-quality synthetic sea salt formulated for fish-only systems, soft coral tanks, and mixed reef aquariums. With balanced levels of calcium, magnesium, and alkalinity, it replicates natural seawater conditions to provide long-term stability and support steady coral and fish health.
Trusted by marine aquarists worldwide, Red Sea Salt is nitrate- and phosphate-free, dissolves quickly, and delivers reliable water chemistry for consistent results.
Key Benefits
Natural Seawater Balance – Ideal for mixed reefs, soft corals, and marine fish systems.
Stable Long-Term Chemistry – Consistent Ca, Mg, and KH values for reliable reefkeeping.
Clean & Pure – Made from pharmaceutical-grade salts, nitrate- and phosphate-free.
Fast Mixing – Dissolves quickly with no residue or clouding.
Trusted Brand – Backed by Red Sea’s 25+ years of marine research.
Core Features
Balanced Calcium, Magnesium & KH – Supports coral health and fish wellbeing.
Trace Elements Included – Matches natural seawater composition for stability.
Pharmaceutical-Grade Purity – Ensures consistency in every batch.
Best For – Fish-only marine systems, soft corals, and mixed reef aquariums.
Technical Specifications
Calcium (Ca): ~410 ppm
Magnesium (Mg): ~1230 ppm
Alkalinity (KH): ~8 dKH
Nitrate & Phosphate: None added
Recommended Salinity: 35 ppt (1.025 sg)
(Values when mixed to 35 ppt / 1.025 sg at 25°C.)
Available Sizes
7kg Bucket – Makes approx. 210 litres of saltwater
20kg Box – Makes approx. 600 litres of saltwater
22kg Bucket – Makes approx. 660 litres of saltwater
Suitable For
Fish-only marine aquariums
Soft coral tanks
Mixed reef aquariums with balanced growth needs
Which Red Sea Salt Should I Choose?
Both Red Sea salts are premium, reef-safe mixes — but designed for different aquarium needs.
Feature Red Sea Salt (Blue Bucket) Red Sea Coral Pro Salt (Black Bucket)
Best For Fish-only, soft coral, and mixed reefs SPS & LPS corals, growth-focused reef tanks
Calcium (Ca) ~410 ppm ~450 ppm
Magnesium (Mg) ~1230 ppm ~1340 ppm
Alkalinity (KH) ~8 dKH (natural seawater balance) ~12 dKH (high alkalinity for rapid coral growth)
Mixing Speed Fast, clear, residue-free Fast, clear, residue-free
Nitrate/Phosphate None added None added
Available Sizes 7kg, 20kg, 22kg 7kg, 20kg, 22kg
Ideal Hobbyist Beginners, soft coral keepers, fish-only systems SPS/LPS reefkeepers seeking strong growth & colour
Shop Now Red Sea Salt (Blue Bucket) Red Sea Coral Pro Salt
More details
Living reef in every harvested grain From the waters of the exotic Red Sea
All-natural eco-friendly harvesting
Biologically balanced levels of foundation elements
Full complement of trace elements
Guaranteed parameters for 10liter / 2.5gal mix.
No Nitrates or Phosphates (Algae Nutrients)
No toxic levels of Heavy Metals
No Chemical Binders
Low moisture content
High yield (seawater per gram of salt)
What has changed in the new Red Sea Salt formula?
The original Red Sea salt was first formulated 20 years ago and has remained the same until now. At that time most hobbyists were using filtered tap water that already had calcium, magnesium and carbonates depending on the hardness of the water. The original Red Sea Salt was formulated to reproduce the parameters of natural seawater after taking into account an average hardness (mineral content) of the tap water. Mixing the original Red Sea Salt with RO or soft tap water would give lower than natural levels of calcium, magnesium and alkalinity. The new Red Sea Salt formula is based on using RO water and therefore has higher levels of these elements.
Warranty Information
All Red Sea salt mixes are produced under strict quality control. If you encounter an issue with a batch, UK-based retailer or Red Sea support services are available