Raise pH and hardness — without feeding algae.Soft, acidic water and low KH make pH crash-prone, but phosphate buffers invite algae in a planted tank.Seachem Alkaline Buffer is a gentle, non-phosphate buffer that raises pH and carbonate hardness (KH) and, paired with Acid Buffer, holds pH between 7.2 and 8.5 — ideal for planted aquariums and soft water.Seachem Laboratories has formulated aquarium chemistry since 1979 at its Madison, Georgia labs, where in-house chemists design products to work as a coordinated system. Alkaline Buffer reflects that approach: it is deliberately non-phosphate so it can raise KH and pH in a planted tank without fuelling algae, and it is calibrated to work alongside Acid Buffer for precise, repeatable control. Use 1 tsp (6 g) per 80 L (20 gallons) daily until the target pH is reached. Pair with Acid Buffer to hold a precise, stable pH. Set your Alkaline Buffer dose by target KH, then use the ratio chart for Acid Buffer. Stabilize pH the plant-safe way. Add to cart.Why Seachem Alkaline Buffer Plant-safe chemistry: non-phosphate formula raises pH and KH without feeding algae. Stable, adjustable pH: paired with Acid Buffer it holds a precise pH between 7.2 and 8.5. Guards against crashes: builds carbonate hardness so soft, low-KH water stops swinging. System-engineered: calibrated by Seachem to pair with Acid Buffer via a published ratio chart. Best ForPlanted aquariums and soft or RO/DI water where pH is prone to crashing and a phosphate buffer would encourage algae.FAQHow much does one dose raise hardness? 1 teaspoon (6 g) per 80 L / 20 gallons raises alkalinity by about 1 meq/L (2.8 dKH).How do I hit a specific pH? Use Alkaline Buffer with Acid Buffer following Seachem's ratio chart; set your Alkaline Buffer dose by target KH first, then adjust with Acid Buffer.Why non-phosphate? Phosphate buffers can fuel algae in planted tanks, so this formula raises pH and KH without adding that food source.What It DoesNon-phosphate buffer that raises pH and alkalinity (KH) and, with Acid Buffer, buffers between 7.2 and 8.5. Gentle and safe; enhances the freshwater environment. Ideal for planted tanks and soft water.DirectionsTo increase pH, use 1 teaspoon (6 g) per 80 L (20 gallons) daily until the desired pH is reached (this dose raises alkalinity by about 1 meq/L / 2.8 dKH). To adjust pH gradually, use with Acid Buffer following Seachem's ratio chart to target a specific pH.Available Sizes70 g, 300 g, 600 g, 1.2 kg, 4 kg
