Seachem Alkaline Buffer

Seachem Alkaline Buffer – Non-Phosphate pH Buffer for Planted Aquariums

Seachem Alkaline Buffer is a non-phosphate buffer designed to raise pH and alkalinity (KH) when used alongside Acid Buffer. Like its counterpart, it’s specially formulated for planted aquariums and tanks with very hard water, avoiding the algae blooms and cloudiness associated with phosphate-based buffers.

Alkaline Buffer raises pH and buffers between 7.2 and 8.5, gently enhancing the freshwater environment without harsh swings or instability. For precise pH control, pair it with Seachem Acid Buffer and use the ratio chart below to dial in your target pH.

Features & Benefits

• Non-phosphate formula, so no risk of algae blooms or cloudiness
• Raises and buffers pH between 7.2 and 8.5
• Increases carbonate alkalinity (KH) safely and gradually
• Ideal for planted aquariums and hard water setups
• Works in tandem with Acid Buffer for precise pH targeting
• Gentle, safe, and suitable for all freshwater aquariums
• Available in a range of sizes to suit any tank volume

Directions for Use

For precise dosing, use a digital scale. Dose 1 teaspoon (6g) per 80L daily until your target pH is reached. To achieve a gradual, controlled pH rise, particularly if your water is soft or poorly buffered, always pair Alkaline Buffer with Acid Buffer and consult the ratio chart below for accurate results. Avoid large single doses, as sudden pH shifts can stress aquatic life.

Sudden or large pH increases can stress or harm fish and invertebrates, so always raise pH gradually over several days rather than all at once. Monitor pH and KH regularly throughout the adjustment process to avoid overshooting your target; you can find our range of testing kits here.

Specifications

pH Targeting Ratio Chart

When using Alkaline Buffer and Acid Buffer together to reach a specific pH, determine the amount of Alkaline Buffer required for your tank volume based on your desired alkalinity (KH), then divide that amount by the ratio in the middle column of the chart below to calculate the correct quantity of Acid Buffer.

Note: This chart is based on use in RO or RO/DI water. Ratios may need adjustment when using tap water.

Recommended For

• Planted aquariums
• Aquariums with very hard water
• Hobbyists targeting a precise pH alongside Acid Buffer