Best Salt Mixes 2019: Five Top Choices for Reef Tanks

Introduction

Choosing the right salt mix is one of the most important decisions for reef tank success. The market offers numerous options, each with different strengths in mixing speed, consistency, cleanliness, and cost. This review evaluates five leading salt mixes across multiple performance criteria to help you find the best fit for your setup.

Most Popular Salt Mixes

The two most popular salt mixes by units sold are Tropic Marin Pro and Red Sea Coral Pro, separated by only a narrow margin in sales volume. Both have earned their popularity through different approaches to formulation and availability.

Tropic Marin Pro emphasizes pharmaceutical-grade materials and rapid mixing, while Red Sea Coral Pro leverages natural sea salts sourced from the Red Sea and enjoys widespread retail availability across the nation. Both represent solid choices for aquarists seeking proven, widely-used products.

Most Economical Option

Reef Crystals stands out as the most budget-friendly salt mix that still delivers reliable results. Based on calculations for a 100-gallon tank performing 10% water changes, Reef Crystals costs approximately 39 cents per gallon. A 200-gallon box yields roughly 170 gallons of 1.026 specific gravity water, working out to about 31 cents per gallon and saving approximately 8 cents per month compared to premium options.

For a typical 100-gallon setup, switching to Reef Crystals can save between 5 and 10 dollars monthly compared to other options. If budget is your primary concern and you want a salt that performs adequately, this remains the go-to choice.

Fastest Mixing Salt Mix

ESV Salt Mix emerges as the fastest-dissolving option when tested across a 24-hour timeframe. While visual inspection in dim lighting can be misleading, controlled testing shows ESV fully dissolves in 4 to 7 hours, compared to 24 to 48 hours for many competitors.

The reason for this speed lies in ESV’s four-part formulation. The system works by first dissolving sodium chloride, which dissolves rapidly. Next, magnesium sulfate is added, and the presence of magnesium in the water prevents precipitation of other components. Finally, calcium, alkalinity, and trace elements are added in liquid form, ensuring complete and rapid homogenization.

This methodology requires additional preparation steps compared to single-part mixes, but the payoff is undeniable mixing speed. Tropic Marin Pro ranks a close second, mixing just a couple of hours behind ESV while maintaining the convenience of a single dry component.

Cleanest and Lowest Maintenance

ESV and Tropic Marin Pro tie for the cleanest salt mixes with the lowest maintenance requirements. Extensive testing across multiple mixing conditions—with and without heat, with and without circulation—revealed that both salts remain crystal clear without brown sediment or sludge buildup.

When filtered through sediment filters, both salts produced clean results, while many competitors left yellow or brown discoloration on the filters. The absence of brown crud means cleaner mixing bins, cleaner pumps, and less frequent maintenance on equipment. This cleanliness almost certainly stems from pharmaceutical-grade materials used in both formulations, which undergo purification processes that remove organics and contaminants from the mining process.

The practical benefit is significant: less unwanted material means less risk of accidentally introducing sediment into your tank, and less time spent cleaning mixing equipment.

Most Consistent Salt Mix

ESV demonstrates the most consistent composition from top to bottom of the bucket. ICP testing and alkalinity measurements showed nearly zero percent difference in calcium and alkalinity levels between the top and bottom of the container, with magnesium varying by less than 0.28 percent.

When tested across 37 trace elements, only three showed more than a 5 percent difference between top and bottom samples. This exceptional consistency stems directly from ESV’s four-part methodology: because major and minor elements are separated and added in precise liquid form, stratification and settling are virtually eliminated.

Tropic Marin Pro also performed exceptionally well, maintaining consistency despite the long supply chain from Germany to the United States. The ability to scoop salt from any point in the bucket and receive identical results bucket after bucket is a hallmark of superior manufacturing.

Best in Show

Tropic Marin Pro takes the top spot as the best overall salt mix for 2019. It performed well across all testing categories: pharmaceutical-grade ingredients without unwanted sediment, faster mixing than nearly all dry-component competitors, and excellent consistency from top to bottom of the bucket.

The deciding factor is convenience. While ESV technically matches or exceeds Tropic Marin Pro in several metrics, the four-part system requires additional steps and planning. Tropic Marin Pro delivers nearly identical results with the simplicity of a single-component dry mix. Simply add it to your mixing vessel and it dissolves quickly without requiring intermediate waiting periods or liquid dosing.

This salt is used across multiple professional systems and testing tanks because it eliminates the need for constant bin cleaning while avoiding the risk of introducing unwanted sediment into display tanks. The modest premium over budget options—typically just a few dollars per month—is justified by the combination of speed, cleanliness, and consistency.

Desired Improvements for 2020

Several improvements would benefit the entire salt mix category. First, truth in advertising regarding yield is essential. Most buckets claim 160 to 200 gallons of mixed saltwater, but actual yields vary significantly. Brightwell NeoMarine stands out as the only brand that accurately represents the actual gallons produced per bucket, a standard all manufacturers should adopt.

Second, transparency through ICP testing and batch documentation would build confidence. Red Sea and Aqua Force already offer batch-specific ICP analysis, allowing customers to verify their salt matches published standards. This level of transparency should become industry standard.

Third, guaranteed analysis labels showing exact potassium, iodine, and other element levels would allow aquarists to hold manufacturers accountable. Finally, single-use pouches in common sizes—such as 30-gallon or 50-gallon portions—would reduce waste and prevent salt degradation from repeated bucket opening.

Conclusion

The best salt mix depends on your priorities. For maximum economy, Reef Crystals delivers reliable results at the lowest cost. For fastest mixing, ESV’s four-part system is unmatched. For the best balance of speed, cleanliness, consistency, and convenience, Tropic Marin Pro remains the top choice. All five options reviewed here represent solid choices for reef aquarists seeking proven, effective salt mixes.