Seachem Acid Buffer 70gm/2.5oz
Acid Buffer is a non-phosphate buffer designed to lower pH and stabilize water conditions when used with Alkaline Buffer. It is ideal for planted aquariums or very hard water systems where phosphate-based buffers may cause algae growth or water cloudiness.
When combined with Alkaline Buffer, Acid Buffer helps maintain pH levels between 6.0 and 8.0. As it lowers pH, it converts carbonate alkalinity (KH) into available CO2, which supports plant growth.
Sold in quantity of: 1
| Specification | Weight: 70gm / 2.5oz |
|---|---|
| Use | Planted aquariums, hard water systems |
| Function | Lowers pH, buffers water, converts KH to CO2 |
| Compatibility | Used with Alkaline Buffer |
FAQ
Can Acid Buffer be used alone without Alkaline Buffer?
No, Acid Buffer must be used in combination with Alkaline Buffer to effectively stabilize pH. Using it alone will not provide proper buffering.
Does Acid Buffer affect phosphate levels in the aquarium?
No, Acid Buffer is non-phosphate and does not contribute to phosphate levels. This makes it suitable for systems prone to algae growth.
How does Acid Buffer convert alkalinity into CO2?
As Acid Buffer lowers pH, it reacts with carbonate alkalinity (KH), releasing CO2 in the process. This CO2 can be beneficial for plant growth in planted tanks.

Stephen Pullman –
Used this with Alkaline Buffer in a planted tank. pH stabilized well between 6.5 and 7.2. No algae issues despite hard water. The CO2 release supports my plants. Easy to dose and effective.
Olivia Jones –
Works as expected with my alkaline buffer. pH drops smoothly and stays stable. No cloudiness or algae. Good for hard water setups. Slight adjustment needed at first, but after a few uses it’s predictable.
Oliver Jones –
Planted tank with high KH and hard water. This buffer helped lower pH without introducing phosphates. Plants are thriving and water clarity improved. Would recommend for planted aquarists.