Seachem Reef Buffer 8.3

Maintain stable pH and alkalinity in your reef aquarium with Seachem Reef Buffer 8.3 a reef specific buffer designed to support consistent water chemistry.

Unlike general saltwater buffers, Reef Buffer is formulated to target a pH around 8.3 while increasing carbonate alkalinity (KH), helping create a more stable environment for corals and invertebrates.

This is a powerful tool when used correctly ideal for maintaining stability, but not something to dose blindly.

How It Works 

Reef Buffer increases:

• pH (toward ~8.3)
• Alkalinity (KH)

These two are directly connected in a reef tank.

When alkalinity rises, pH becomes more stable and resistant to swings.

Result: A more consistent, reef-safe environment

IMPORTANT: Proper Use 

This product is effective but it must be used with testing.

Before dosing:

• Test KH (alkalinity)
• Test pH

After dosing:

• Re test to monitor changes

What to avoid

• Don’t dose without testing
• Don’t add large amounts at once
• Don’t try to “chase numbers” quickly

Overdosing can:

• Spike alkalinity too fast
• Stress corals
• Throw off tank balance

Best Practice

• Dose in small amounts
• Allow time between adjustments
• Aim for stability over perfection

What It Helps With

• Low pH in reef aquariums
• Unstable alkalinity (KH)
• Maintaining consistent reef parameters
• Supporting coral health and stability

Perfect For

• Reef aquariums (LPS, SPS, mixed reefs)
• Hobbyists monitoring alkalinity and pH
• Maintaining stable water chemistry

Directions

Use as directed to gradually raise pH and alkalinity.

Add in small increments and test regularly
Do not exceed recommended dosing levels

Pro Tip

Pair this product with a reliable test kit:

• KH (alkalinity) test
• pH monitoring

This ensures you’re adjusting safely and not overshooting your target levels