Seachem Alkaline Buffer 300 gm

Seachem Alkaline Buffer raises pH and alkalinity to 7.2-8.5 without phosphate, designed for use in planted aquariums.

• Adjusts pH to 7.2—8.5.
• Designed for use in planted aquariums.
• Increases alkalinity.
• Contains no phosphate.

Alkaline Buffer is a non–phosphate buffer to raise pH and alkalinity (KH) and buffer with Acid Buffer. These buffers are designed for the planted aquarium or for very hard water where phosphate buffers may pose an algae or cloudiness problem. Alkaline Buffer raises pH and buffers between 7.2 and 8.5. It is gentle, safe, and enhances the freshwater environment.

Compatibility

Freshwater, including planted tanks — it is sodium bicarbonate based and contains no phosphate, so it will not feed algae the way a phosphate buffer can.

It pairs with Acid Buffer to hold a chosen pH. The published ratio chart assumes RO or RO/DI water; in tap water the ratios need adjusting.

Dosage & Directions

Use 6 g (one teaspoon) for every 80 L (20 US gallons) daily until the target pH is reached. Each such dose raises alkalinity by about 1 meq/L (2.8 dKH). It adjusts pH into the 7.2–8.5 range.

Move pH slowly. A tank taken from 6.5 to 8.0 in one dose will cost you fish that a week of small doses would not have.

Pack Size

300 g tub.

Seachem make this line in sizes from 70 g to 4 kg

Keep the container closed and dry. These powders take up moisture from the air, and a caked tub doses inaccurately.

Freshness & Storage

Every batch we dispatch carries a minimum of 6 months' remaining shelf life. Store this product in a cool, dry place away from direct sunlight, with the cap or inner foil closed tightly after each use.

Returns & Replacement

Returns are accepted within 7 days of delivery, provided the item is unused and in its original packaging. Manufacturer-sealed items cannot be returned once the seal is broken, and sale-priced items are not refundable.

If your item arrives defective or damaged, message us on WhatsApp with your order number — or email us, if you would rather — and we will replace it. Approved replacements are delivered within 3 to 5 business days. Transit damage is covered by insurance on every shipment. If tracking shows delivered but nothing reached you, tell us within 72 hours, which is the reporting window Indian couriers allow. Damage caused during installation or use is not covered; replacement spares for such cases are chargeable.

Full terms are on our Cancellation & Returns page.