Waterbox Reef Salt is a synthetic marine salt mix engineered specifically for mixed reefs and SPS-dominant systems. Loaded with major and minor trace elements at reef-stable levels, it dissolves ultra-fast and clean for confidence-inspiring water changes — and every batch is ICP-OES tested every 2,000 lbs to guarantee consistency. Available in 5 KG / 11 LB and 20 KG / 44 LB box sizes.
Browse more in our salt mixes collection or shop the full saltwater lineup.
Why Reefkeepers Choose Waterbox Reef Salt
- Designed for mixed reefs & SPS— formulated specifically for the demanding water-chemistry needs of stony coral systems.
- Synthetic reef salt mix— no harvested seawater, no inconsistencies; every box mixes to the same target.
- Full major & minor trace elements— calcium, alkalinity, magnesium plus the trace elements corals consume.
- Ultra-fast and clean mixing— dissolves quickly with no residue, so you can do same-day water changes.
- ICP-OES tested every 2,000 lbs— independently verified consistency from box to box.
Mixing & Usage
Standard salinity:Mix to a target specific gravity of 1.025 (35 ppt). Use RODI water and an accurate refractometer for best results.
Approximate ratio:Roughly ½ cup of salt per gallon of RODI water; always confirm with a refractometer.
Aerate & circulate:Mix in a clean container with a powerhead for at least 1–2 hours (or overnight) before use. Match temperature to your display before adding.
Water changes:Replace 10% weekly or 20% bi-weekly to maintain stable parameters in mixed reef and SPS systems.
Specifications
| Brand | Waterbox |
| Product | Reef Salt — Synthetic Marine Salt Mix |
| Sizes | 5 KG / 11 LB box and 20 KG / 44 LB box |
| Best For | Mixed reefs, SPS-dominant tanks, FOWLR |
| Mix Type | Synthetic — fully reef-ready trace element profile |
| Quality Control | ICP-OES tested every 2,000 lbs produced |
| Water Type | Saltwater only |
| Recommended Salinity | 1.025 SG / 35 ppt |
Recommended Pairings
- Saltwater Refractometer — verify salinity every batch.
- Hanna HI96822 Digital Refractometer — lab-grade accuracy for salinity.
- Red Sea Reef Foundation Pro Test Kit — track Ca, Alk, Mg between water changes.
- Hanna Marine Coral Care Kit — full-suite reef testing.
- Waterbox Calcium, Alkalinity & Conditioner — round out your Waterbox water-care system.
- Browse all salt mixes if you’d like to compare alternatives.
Frequently Asked Questions
Is this salt good for SPS?
Yes — Waterbox Reef Salt is formulated specifically for mixed reefs and SPS-dominant systems, with elevated alkalinity and trace element levels SPS corals demand.
How fast does it mix?
Waterbox Reef Salt is engineered for ultra-fast, clean mixing. With proper circulation and aeration, it typically dissolves clear within 30–60 minutes; we still recommend at least an hour (or overnight) before use to ensure full equilibration.
How many gallons does each box make?
Approximate yield depends on target salinity, but the 5 KG / 11 LB box mixes roughly 35–40 gallons and the 20 KG / 44 LB box mixes roughly 140–160 gallons at 1.025 SG. Always verify with a refractometer.
Why does ICP-OES testing matter?
Synthetic salt mixes can drift batch-to-batch if not monitored. ICP-OES testing every 2,000 lbs verifies that each production run hits the same trace-element targets — so the salt you buy today mixes to the same chemistry as the salt you bought last month.
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