Fast Aquatics

Instant Ocean is the original synthetic sea salt mix and remains the most-sold marine salt globally. The product line includes original Instant Ocean (FOWLR-grade), Instant Ocean Reef Crystals (reef-grade with elevated calcium and alkalinity), and Sea Salt mixes for various use cases.

Known for

Reef Crystals

Reef-grade salt mix with ~12 dKH alkalinity, ~440 ppm calcium, elevated trace elements. The default reef salt for cost-sensitive hobbyists.

Original Instant Ocean

Standard synthetic sea salt for fish-only and FOWLR systems. Lower alkalinity (~7 dKH) than reef formulations.

Bulk pricing

Available in 160-200 gallon boxes at warehouse stores and online retailers - the most cost-effective reef salt by gallon-mixed.

Pros and cons

Pros
  • Lowest cost reef-capable salt mix on the market
  • Widely available at chain retailers
  • 60-year track record of consistent formulation
Cons
  • Batch-to-batch variation higher than premium German brands
  • Trace element profile is basic - SPS reefs may want premium salt

Common competitors

Red Sea Coral Pro · Tropic Marin · Aquaforest · Fritz Reef Pro Elite