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Additives by Type: Aquarium Buffer

Aquarium pH Buffer replenishes the carbonate and bicarbonate required to maintain or increase the alkalinity of captive marine systems. Alkalinity (carbonate hardness) in captive marine systems constantly decreases as biological processes remove carbonate, and produce acids that neutralize carbonate. Proper alkalinity should be maintained around 2.5-2.9 me (7-8 dKH) for marine fish tanks and 3.2-3.6 me (9-10 dKH) for reef tanks.

Sometimes aquariums in closed offices and homes maintain a low pH due to the accumulation of carbon dioxide in the air. This excess CO2 dissolves into the aquarium water and depresses the average pH. The Two Little Fishies CDX Carbon Dioxide Adsorption Media helps maintain and elevate aquarium pH by removing CO2 (carbon dioxide) introduced through a protein skimmer.  Simply pour the CDX into a tall columnar reactor such as the Two Little Fishies PhosBan Reactor and connect the CDX-filled reactor to your protein skimmer's air intake hose. You can use the Two Little Fishies CDX Adaptor or a similar barbed, reducing fitting to connect the air intake for the protein skimmer to the outflow pipe of the reactor.
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Brightwell Aquatics Alkalin8.3 KH Buffer, 250 ml
Brightwell Aquatics Alkalin8.3 KH Buffer, 250 ml
Our Price: $5.40
In Stock

  • Brightwell Aquatics Alkalin8.3 KH Buffer, 250 ml is a highly-effective alkalinity(KH)-increasing (”buffer”) solution
  • Helps increase pH stability in an aquarium by raising the alkalinity
  • Provides a source of carbonates, which make up the majority by
    weight of aragonite, the mineral secreted by reef-building organisms
    as skeletal material
  • Continued addition raises pH until 8.3 is reached, at which point
    the pH remains unchanged and the alkalinity alone increases
  • Over 50% stronger than most competing products
  • Free of phosphate, silicate, and organic material
  • Formulated by a marine scientist
Brightwell Aquatics Alkalin8.3 KH Buffer, 500 ml
Brightwell Aquatics Alkalin8.3 KH Buffer, 500 ml
Our Price: $7.80
In Stock

  • Brightwell Aquatics Alkalin8.3 KH Buffer, 500 ml is a highly-effective alkalinity(KH)-increasing (”buffer”) solution
  • Helps increase pH stability in an aquarium by raising the alkalinity
  • Provides a source of carbonates, which make up the majority by
    weight of aragonite, the mineral secreted by reef-building organisms
    as skeletal material
  • Continued addition raises pH until 8.3 is reached, at which point
    the pH remains unchanged and the alkalinity alone increases
  • Over 50% stronger than most competing products
  • Free of phosphate, silicate, and organic material
  • Formulated by a marine scientist
Brightwell Aquatics Alkalin8.3-P KH Buffer, 1000 grams
Brightwell Aquatics Alkalin8.3-P KH Buffer, 1000 grams
Our Price: $15.80
In Stock

  • Brightwell Aquatics Alkalin8.3-P KH Buffer is a highly-effective alkalinity-increasing (”buffer”) powdered
    blend for all marine and reef aquaria
  • Helps increase pH stability in an aquarium by raising the
    alkalinity; continued addition raises pH until 8.3 is reached, at
    which point the pH remains unchanged and the alkalinity
    alone increases
  • Provides a source of carbonates, which make up the majority
    by weight of aragonite, the mineral secreted by reef-building
    organisms as skeletal material
  • Formulated by a marine scientist
Brightwell Aquatics Alkalin8.3-P KH Buffer, 250 grams
Brightwell Aquatics Alkalin8.3-P KH Buffer, 250 grams
Our Price: $5.80
In Stock



  • Brightwell Aquatics Alkalin8.3-P KH Buffer, 250 grams is a highly-effective alkalinity-increasing (”buffer”) powdered
    blend for all marine and reef aquaria
  • Helps increase pH stability in an aquarium by raising the
    alkalinity; continued addition raises pH until 8.3 is reached, at
    which point the pH remains unchanged and the alkalinity
    alone increases
  • Provides a source of carbonates, which make up the majority
    by weight of aragonite, the mineral secreted by reef-building
    organisms as skeletal material
  • Formulated by a marine scientist
Brightwell Aquatics Alkalin8.3-P KH Buffer, 500 grams
Brightwell Aquatics Alkalin8.3-P KH Buffer, 500 grams
Our Price: $9.80
In Stock

  • Brightwell Aquatics Alkalin8.3-P KH Buffer, 500 grams is a highly-effective alkalinity-increasing (”buffer”) powdered
    blend for all marine and reef aquaria
  • Helps increase pH stability in an aquarium by raising the
    alkalinity; continued addition raises pH until 8.3 is reached, at
    which point the pH remains unchanged and the alkalinity
    alone increases
  • Provides a source of carbonates, which make up the majority
    by weight of aragonite, the mineral secreted by reef-building
    organisms as skeletal material
  • Formulated by a marine scientist
Brightwell Aquatics Alkalin8.3-P, 4 kg
Brightwell Aquatics Alkalin8.3-P, 4 kg
Our Price: $51.51
(Out of Stock)


  • Brightwell Aquatics Alkalin8.3-P, 4 kg, is a KH buffer powder for all marine fish and reef aquaria
  • Highly-effective alkalinity-increasing (”buffer”) powdered blend.
  • Helps increase pH stability in an aquarium by raising the alkalinity; continued addition raises
    pH until 8.3 is reached, at which point the pH remains unchanged and the alkalinity
    alone increases.
  • Provides a source of carbonates, which make up the majority by weight of aragonite, the
    mineral secreted by reef-building organisms as skeletal material.
Brightwell Aquatics PH Plus Liquid PH Increaser, 250 ml
Brightwell Aquatics PH Plus Liquid PH Increaser, 250 ml
Our Price: $5.10
In Stock

  • Increases pH in marine and reef aquaria
  • May be used to help increase pH in aquaria that have adequate alkalinity yet have chronically-depressed pH levels; while not intended to act as a permanent solution to such issues, pH+ may be used as needed until the cause of depressed pH is discovered and remedied
  • Stronger than most competing products
  • Composed of purified water and ultra-high purity materials
  • Formulated by a marine scientist
Brightwell Aquatics PH Plus Liquid PH Increaser, 500 ml
Brightwell Aquatics PH Plus Liquid PH Increaser, 500 ml
Our Price: $8.70
In Stock

  • Increases pH in marine and reef aquaria
  • May be used to help increase pH in aquaria that have adequate alkalinity yet have chronically-depressed pH levels; while not intended to act as a permanent solution to such issues, pH+ may be used as needed until the cause of depressed pH is discovered and remedied
  • Stronger than most competing products
  • Composed of purified water and ultra-high purity materials
  • Formulated by a marine scientist
E.S.V. 32 oz B-Ionic Calcium Buffer System
E.S.V. B-Ionic Calcium Buffer System 32 oz
Our Price: $13.99
In Stock

The E.S.V. B-Ionic Calcium Buffer is the original, unique, easy to use, two-component liquid supplement system. When using equal volumes of each component, the aquarist can easily maintain calcium and alkalinity levels with no mixing of powders, disruption of ionic balance, or addition of organic chemicals. In addition to supplying highly concentrated calcium and carbonate alkalinity required for calcification, B-Ionic Calcium Buffer System also provides all other important major, minor, and trace elements in the proper ratios to duplicate the composition of synthetic seawater. As a result, the B-Ionic Calcium Buffer System will help restore inorganic ions lost from protein skimming and help maintain the ionic balance of the aquarium water.
E.S.V. 64 oz B-Ionic Calcium Buffer System
E.S.V. B-Ionic Calcium Buffer System 64 oz
Our Price: $18.99
In Stock

The E.S.V. B-Ionic Calcium Buffer is the original, unique, easy to use, two-component liquid supplement system. When using equal volumes of each component, the aquarist can easily maintain calcium and alkalinity levels with no mixing powders, disruption of ionic balance, or addition of organic chemicals. In addition to supplying highly concentrated calcium and carbonate alkalinity required for calcification, B-Ionic Calcium Buffer System also provides all other important major, minor, and trace elements in the proper ratios to duplicate the composition of synthetic seawater. As a result, the B-Ionic Calcium Buffer System will help restore inorganic ions lost from protein skimming and help maintain the ionic balance of the aquarium water.
E.S.V. 2 gallon B-Ionic Calcium Buffer System Concentrate Refills
E.S.V. B-Ionic Calcium Buffer System Concentrate Refills 2 gallon
Our Price: $29.99
In Stock

The E.S.V. B-Ionic Calcium Buffer is the original, unique, easy to use, two-component liquid supplement system. When using equal volumes of each component, the aquarist can easily maintain calcium and alkalinity levels with no mixing powders, disruption of ionic balance, or addition of organic chemicals. In addition to supplying highly concentrated calcium and carbonate alkalinity required for calcification, B-Ionic Calcium Buffer System also provides all other important major, minor, and trace elements in the proper ratios to duplicate the composition of synthetic seawater. As a result, the B-Ionic Calcium Buffer System will help restore inorganic ions lost from protein skimming and help maintain the ionic balance of the aquarium water.
E.S.V. 8 gallon B-Ionic Calcium Buffer System Concentrate Refills
E.S.V. B-Ionic Calcium Buffer System Concentrate Refills 8 gallon
Our Price: $99.99
In Stock

The E.S.V. B-Ionic Calcium Buffer is the original, unique, easy to use, two-component liquid supplement system. When using equal volumes of each component, the aquarist can easily maintain calcium and alkalinity levels with no mixing powders, disruption of ionic balance, or addition of organic chemicals. In addition to supplying highly concentrated calcium and carbonate alkalinity required for calcification, B-Ionic Calcium Buffer System also provides all other important major, minor, and trace elements in the proper ratios to duplicate the composition of synthetic seawater. As a result, the B-Ionic Calcium Buffer System will help restore inorganic ions lost from protein skimming and help maintain the ionic balance of the aquarium water.
Inland Seas Marine and Reef Buffer 1 kg
Inland Seas Marine and Reef Buffer 1 kg
List Price: $17.95
Our Price: $16.20
You save $1.75!
In Stock

Inland Seas Marine and Reef Buffer replenishes the carbonate and bicarbonate required to maintain or increase the alkalinity of captive marine systems. Alkalinity (carbonate hardness) in captive marine systems constantly decreases as biological processes remove carbonate, and produce acids that neutralize carbonate. Proper alkalinity should be maintained around 2.5-2.9 me (7-8 dKH) for marine fish tanks and 3.2-3.6 me (9-10 dKH) for reefs.
Inland Seas Marine and Reef Buffer 20 kg
Inland Seas Marine and Reef Buffer 20 kg
List Price: $159.95
Our Price: $119.95
You save $40.00!
In Stock

Inland Seas Marine and Reef Buffer replenishes the carbonate and bicarbonate required to maintain or increase the alkalinity of captive marine systems. Alkalinity (carbonate hardness) in captive marine systems constantly decreases as biological processes remove carbonate, and produce acids that neutralize carbonate. Proper alkalinity should be maintained around 2.5-2.9 me (7-8 dKH) for marine fish tanks and 3.2-3.6 me (9-10 dKH) for reefs.
Inland Seas Marine and Reef Buffer 8 kg
Inland Seas Marine and Reef Buffer 8 kg
List Price: $92.95
Our Price: $83.94
You save $9.01!
In Stock

Inland Seas Marine and Reef Buffer replenishes the carbonate and bicarbonate required to maintain or increase the alkalinity of captive marine systems. Alkalinity (carbonate hardness) in captive marine systems constantly decreases as biological processes remove carbonate, and produce acids that neutralize carbonate. Proper alkalinity should be maintained around 2.5-2.9 me (7-8 dKH) for marine fish tanks and 3.2-3.6 me (9-10 dKH) for reefs.
Kent Marine Nano Reef Part A-B
Kent Marine Nano Reef Part A-B 16 oz each (32 oz total)
Our Price: $13.87
In Stock

The Kent Marine Nano Reef Part A-B is a combination calcium and alkalinity supplement formulated for nano reefs and smaller reef systems.
  • Easy-to-use, 2-part liquid system simplifies reef supplementation vital for healthy coral and invertebrate growth
  • Provides all important major, minor, and trace elements in proper ratios while increasing alkalinity and maintaining proper pH
  • Minimizes overdose or adverse chemical reactions
  • Each 16 oz bottle treats 946 gallons
Kent Marine Nano Reef Part A-B
Kent Marine Nano Reef Part A-B 8 oz each (16 oz total)
List Price: $11.99
Our Price: $8.81
You save $3.18!
In Stock

The Kent Marine Nano Reef Part A-B is a combination calcium and alkalinity supplement formulated for nano reefs and smaller reef systems.
  • Easy-to-use, 2-part liquid system simplifies reef supplementation vital for healthy coral and invertebrate growth
  • Provides all important major, minor, and trace elements in proper ratios while increasing alkalinity and maintaining proper pH
  • Minimizes overdose or adverse chemical reactions
  • Each 8 oz bottle treats 473 gallons
Kent Marine Pro Buffer dKH 16 oz
Kent Marine Pro Buffer dKH 16 oz
Our Price: $7.24
In Stock

Enhanced Kent Marine Pro Buffer dKH with coralline accelerator raises alkalinity or buffering capacity and works automatically to control pH in any marine aquarium.  In addition, when used with any of our calcium additives, it encourages strong coralline algae growth.  Each 16 oz. of Pro Buffer dKH will treat 1,900 gallons or 7,200 liters.
Kent Marine Pro Buffer dKH 8 oz
Kent Marine Pro Buffer dKH 8 oz
Our Price: $4.63
In Stock

Enhanced Kent Marine Pro Buffer dKH with coralline accelerator raises alkalinity or buffering capacity and works automatically to control pH in any marine aquarium.  In addition, when used with any of our calcium additives, it encourages strong coralline algae growth.  Each 16 oz. of Pro Buffer dKH will treat 1,900 gallons or 7,200 liters.
Kent Marine Superbuffer, 1000 grams
Kent Marine Superbuffer, 1000 grams
Our Price: $15.26
In Stock

Kent Superbuffer-dKH is a specially formulated pH buffer and alkalinity or carbonate hardness (KH) builder, designed to adjust the pH of saltwater aquariums to the range of 8.0 to 8.3 and build the KH.
  • Designed to mix clear with little or no cloudiness or precipitation
  • Will not flake on your corals as other competing products can
  • Compatible with and designed for use with Kalkwasser Mix, Liquid Calcium, or Turbo-Calcium by Kent Marine