Instant Ocean Sea Salt Mix

Instant Ocean Sea Salt is the trusted, economical marine salt that hobbyists and public aquariums have relied on for decades. It dissolves quickly, mixes clear, and delivers balanced, reef-safe water chemistry for fish-only, FOWLR, and reef tanks alike. Build your saltwater tank with saltwater supplies and corals.

Why This Salt

• The most trusted marine salt, used for decades
• Balanced, reef-safe formula for fish and invertebrates
• Dissolves fast and mixes clear
• Great value for regular water changes
• Consistent results every mix

How to Mix

• Mix with RO or RO/DI water, not tap water, for best results
• Add salt to water slowly with a powerhead running, never add water to salt
• Mix and aerate until fully dissolved and clear, usually a few hours to overnight
• Check salinity with a refractometer and target about 1.025 for reef tanks

Choose Your Size

Specifications

Pair It With

• Reef tank with corals? Step up to Instant Ocean Reef Crystals
• Measure salinity with a refractometer
• Test and dose with alkalinity and calcium kits
• Browse more salt mixes and corals

Frequently Asked Questions

Is Instant Ocean Sea Salt reef safe?
Yes. It provides balanced, reef-safe water chemistry. For coral-focused tanks, Reef Crystals adds extra calcium and trace elements.

Which size should I buy?
The 50 gallon bag suits small tanks and water changes, while the 200 gallon box is the best value.

What water should I use?
Use RO or RO/DI water for the cleanest, most consistent mix.