Red Sea Salt - 7kg bucket
Cost per litre
$0.27
Red Sea Salt - 7kg bucket
Consistent reef-grade seawater in under 20 minutes, from bucket to tank. Red Sea Salt is the brand's original moderate-alkalinity formulation — a balanced mix of major and minor elements suited to both fish-only systems and naturally-run reef tanks. This 7 kg bucket makes approximately 210 L of mixed saltwater.
Key features
- Makes 210 L per bucket — check the current cost per litre on the product page when budgeting for a water change.
- Moderate alkalinity, 8 dKH — a balanced formulation suited to fish-only systems and reef tanks running natural, undosed nutrient levels.
- Dissolves fast and clear — Red Sea states the current formula mixes from bucket to tank-ready in around 20 minutes.
- Consistent batch to batch — the same balance of calcium, magnesium and bicarbonates every bucket, so parameters don't drift with each water change.
Specifications
| Pack size | 7 kg bucket |
|---|---|
| Makes | Approximately 210 L of mixed saltwater |
| Alkalinity | 8 dKH |
| Formulation | Moderate, balanced — calcium, magnesium and bicarbonates at natural, undosed levels |
| Suited to | Fish-only marine systems and naturally-run reef tanks |
Red Sea doesn't publish exact calcium, alkalinity and magnesium figures for this formulation on its consumer-facing pages — target parameters can be checked using Red Sea's MyBatch batch-lookup service with the batch number printed on the bucket.
Which size do I need?
| Pack size | Makes |
|---|---|
| Red Sea Salt 7 kg bucket (this product) | 210 L |
| Red Sea Salt 10 kg bag | 300 L |
| Red Sea Salt 20 kg refill box | 600 L |
| Red Sea Salt 25.2 kg bag | 750 L |
Litre for litre, the 10 kg bag is currently the cheapest way to buy Red Sea Salt — the bucket format costs a little more per litre for the convenience of a smaller, resealable, easy-to-store container. If storage space and top-up frequency aren't a constraint, a larger pack is the better long-run buy.
Dosage and directions
Mix into RO or RO/DI water with circulation and, ideally, some aeration, allowing the salt to fully dissolve before checking parameters. Match temperature and salinity to your display before adding, and use freshly mixed saltwater promptly rather than storing it mixed for extended periods. For reef tanks running elevated, dosed parameters rather than natural levels, Red Sea's Coral Pro Salt is the higher-alkalinity alternative in the same range.
Suitable for, and not suitable for
Suitable for fish-only marine systems and reef tanks kept at natural, undosed nutrient and alkalinity levels. Less suited to SPS-dominant reef systems chasing elevated calcium and alkalinity through dosing — Red Sea Coral Pro Salt is formulated for that use case instead.
Warranty and delivery
Consumer guarantee rights under Australian Consumer Law apply. Standard delivery — no special freight requirements for this pack size.
Goes well with
- Red Sea Salt Measuring Cup — for consistent, repeatable scoops batch after batch
- A refractometer, to verify salinity once mixed and temperature-stable
Common questions
How much water does one 7 kg bucket make?
Approximately 210 L of mixed saltwater at standard reef salinity.
Is this the same salt as the bigger bags, just smaller?
Yes — Red Sea Salt is the same moderate-alkalinity formulation across the 7 kg bucket, 10 kg bag, 20 kg refill box and 25.2 kg bag. Only the pack size and cost per litre change.
Is the bucket better value than the bigger bags?
Not quite — compare the current cost per litre for each pack size on the product page before deciding. The bucket earns its place as a smaller, resealable, easier-to-store option rather than as the cheapest per litre.
Will this suit my reef tank, or do I need Coral Pro?
If you're running natural, undosed parameters, Red Sea Salt suits your tank. If you're dosing to elevated calcium and alkalinity for SPS growth, Coral Pro Salt is Red Sea's formulation for that.
