Seachem Acid Buffer

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

Seachem Acid Buffer is a non-phosphate buffer designed to lower and stabilise pH when used alongside Alkaline Buffer. It’s specially formulated for planted aquariums or tanks with very hard water, avoiding the algae blooms and cloudiness that phosphate-based buffers can cause.

Acid Buffer effectively lowers pH and buffers between 6.0 and 8.0, and as it works, it converts carbonate alkalinity (KH) into available CO₂, a natural bonus for your aquatic plants. For precise pH targeting, pair it with Seachem Alkaline 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
• Lowers and buffers pH between 6.0 and 8.0
• Ideal for planted aquariums and hard water setups
• Converts carbonate alkalinity (KH) into available CO₂ for plants
• Works in tandem with Alkaline Buffer for precise pH targeting
• Available in a range of sizes to suit any tank volume

Directions for Use

Dose ¼ teaspoon (2g) per 80L daily until your desired pH is reached. In very hard or highly alkaline water, larger doses may be necessary. For a gradual, controlled pH shift, or if your water is soft or poorly buffered, always pair Acid Buffer with Alkaline Buffer and consult the ratio chart below for accurate results. Introduce pH changes gradually over several days rather than all at once, as rapid swings can stress fish and invertebrates. Monitor pH and KH regularly throughout the adjustment process; you can find our full range of testing kits here.

Specifications

pH Targeting Ratio Chart

When using Acid Buffer and Alkaline 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 or highly alkaline water
• Hobbyists targeting a precise pH alongside Alkaline Buffer