Seachem Marine Buffer

• Targets pH 8.3 and self-limits – Seachem states it will not push pH above 8.3 even on an accidental overdose.
• Adds roughly 1 meq/L of alkalinity alongside the pH lift, with every standard dose.
• Treats saltwater for under 1c per litre on both pack sizes – see Cost per litre below.
• Dissolves fast when pre-mixed in freshwater before adding to the tank.
• One dose rate for new mixes and maintenance – only the frequency changes.

Litres treated calculated at Seachem's published maintenance dose of 5 g per 80 L.

Dissolve 5 g (one level teaspoon) in at least a cup of freshwater, then add per 80 L of tank water. For a new mix, dose daily until pH stabilises at 8.3 – usually within a week. After that, dose the same amount every two to four weeks to hold the level. Don't dose Marine Buffer directly alongside calcium, magnesium or strontium supplements – add them on alternate days, or at least 30 minutes apart.

Seachem markets this as safe for reef aquariums. If a persistent cloudiness or precipitate lasts more than about 15 minutes after dosing, that's a sign the water's ionic balance is off – do a water change before dosing again rather than adding more.

Suitable for FOWLR and reef marine tanks that need pH raised or held at 8.3. Not the right product for a tank under heavy biological acid load – Seachem's own guidance is that Reef Buffer is the better choice there. Not for freshwater use.

• Seachem Reef Buffer – the stronger option for reef tanks with a heavy bioload.
• Seachem Reef Advantage Calcium – dose on alternate days from this buffer, not at the same time.
• A marine pH test kit – confirm where your tank sits before dosing on a schedule.

Covered by Seachem's standard product guarantee in addition to your rights under Australian Consumer Law. Ships as a standard parcel.

Can I overdose this by accident?

Seachem states Marine Buffer will not raise pH above 8.3, even if you add more than the recommended dose. It's designed to self-limit at that level.

Is it safe for a reef tank?

Seachem markets it as reef safe. For tanks with a heavy biological acid load, Seachem's own advice is that Reef Buffer holds up better – Marine Buffer is the standard choice for most FOWLR and reef setups.

Can I dose it with my calcium supplement at the same time?

No – don't mix it directly with calcium, magnesium or strontium additives. Dose them on alternate days, or space doses at least 30 minutes apart.

Do I use the same dose for a new tank as for maintenance?

Yes, the dose rate doesn't change – 5 g per 80 L either way. What changes is frequency: daily while a new mix comes up to pH, then every two to four weeks once it's holding steady.

What if the water goes cloudy after dosing?

A little cloudiness that clears within about 15 minutes is normal. If it lingers longer than that, it's a sign of an ionic imbalance – do a water change before dosing again.