Marine Buffer 1 kg — Buffer pH 8.3 with Borates Seawater | Seachem

Seachem Marine Buffer in a 1 kg format is a multi-component powder buffer that raises and stabilizes the pH at 8.3 in all saltwater aquariums. Its unique formulation, based on sodium, magnesium, calcium, strontium, and potassium salts in the form of carbonates, bicarbonates, chlorides, sulfates, and borates, prevents the pH from exceeding 8.3, even in the event of accidental overdosing. The 1 kg format is the economical choice for large marine aquariums or systems requiring frequent pH adjustments.

Main advantages

• Stabilizes the pH at 8.3 — impossible to exceed this level even in case of overdose
• Contains borates for increased stability — the first buffer on the market to incorporate borate salts
• Contains magnesium to mitigate the effects of precipitation
• Multi-salt mixture (Na, Mg, Ca, Sr, K) — superior to simple sodium bicarbonate
• 1 kg format — economical for large systems and long-term maintenance

Use in marine aquariums

Total alkalinity relies on three main ions: carbonate (raising the pH to around 9.1), bicarbonate (around 7.8), and borate (around 9.5). Marine Buffer combines these elements to target a stable pH of 8.3. Most marine salts contain significant amounts of bicarbonates, which lower the pK of the buffer system to around 7.8. Marine Buffer compensates for this influence with a pK slightly above 8.3. It is safe for use in reef aquariums, and its effectiveness improves with continued use.

Dosage

• 5 g (1 level teaspoon) per 80 L (20 US gallons). Each dose increases alkalinity by 1 meq/L.
• Dissolve in at least 250 ml (1 cup) of fresh water before adding to the tank.
• Add daily until the pH stabilizes at 8.3 — from 1 day to 1 week depending on the original pH and alkalinity.
• Then, use every 2 weeks to once a month to maintain a pH of 8.3.

Precipitation diagnosis

In ionically balanced seawater, the Marine Buffer produces little precipitation or turbidity. If a significant precipitate forms and does not dissolve within 15 minutes, the water has an ionic imbalance requiring a water change before continued use. A slight, white, flaky precipitate is temporary magnesium carbonate that redissolves within 30 minutes; this is often observed when magnesium levels are high.

Manufacturer's precautions

• Do not mix directly with a calcium, magnesium or strontium supplement.
• If regular dosing is not enough to maintain the pH, check overcrowding, overfeeding, or other management practices as a likely cause.
• Effectiveness improves with continued use

Available formats

• 50 g
• 250 g
• 500 g
• 1 kg
• 4 kg

Why choose the Marine Buffer from ReefSolution?

The 1 kg format is the cost-effective choice for aquarists maintaining large marine systems. For reef tanks with high organic loads, consider Seachem Reef Buffer (pK 8.6). Supplement with Seachem Marine Trace for trace elements and monitor your parameters with the Salifert KH/Alk Test Kit or the Hanna Checker Alkalinity.

Frequently Asked Questions

Is the 1kg format advantageous for large marine aquariums?

Yes. The 1 kg format offers better value for money for larger systems or aquariums requiring frequent pH adjustments. It allows for regular maintenance over several months without frequent repurchasing.

Is the Marine Buffer safe for reef aquariums?

Yes. The Marine Buffer can be used safely in reef aquariums. For reef systems where the pH regularly drops below 8.2 despite dosing, the Seachem Reef Buffer with its pK of 8.6 will be more effective.

Why is Marine Buffer superior to sodium bicarbonate?

Pure sodium bicarbonate can raise the pH to dangerous levels and offers no protection against overdosing. Marine Buffer is a proprietary blend of carbonates, bicarbonates, and borates that locks the pH at 8.3 and improves the overall stability of the buffer system.