KH Test MBreda

KH Test MBreda

Use of the MBreda Alkalinity Test Kit:

  1. Transfer 3 ml of aquarium water into the glass tube
  2. KH Solution: Place the micro nozzle that comes with the kit in the doser (1 ml syringe) fill with the KH solution up to the 1 ml mark, note that there is an indication on the plunger nozzle (rubber) where it should be at the 1 ml mark after full. This indication point will be used for reading after the titration of the solution.
  3. Add the KH solution drop by drop into the glass tube, shaking well after each drop, until the color changes from Blue to Green, then read the final marking on the meter.
  4. Use the conversion table to define the KH alkaline reserve.

See the Kit usage illustration:

Determination of the KH alkaline reserve

The KH Test MBreda analysis kit is based on neutralization reactions between an acid and carbonates in solution.

Weak acid titration makes use of specific pH indicators to visualize the end point of the reaction, indicating the alkaline reserve of the water.

The reaction below exemplifies the main reaction:

Depending on the chemical form in which the carbonates are found, linked or not, this reaction can be instantaneous or not, for this reason, the agitation after the addition of a small volume of the titrant solution (which already contains the pH indicator) is extremely important. importance, in order to guarantee the complete reaction.

Correction of KH alkalinity in the aquarium:

When the KH value is below the ideal for aquariums with corals, it is important to supplement with Reef Basis B MBreda® for marine aquariums.

To define the amount to be added, use the formula below:

Reef Basis B mass (g) = KH(intended) – KH(actual) x V(Aquarius) x 0.0357

Where: Reef Basis B mass = MBreda product for KH supplementation for marine aquariums.

The result expresses the mass in grams of the solid product that must be added to the aquarium.

See Reef Basis B usage recommendations.

KH(intended) = The dKH value you want to achieve in the aquarium. Express the result in dKH. Ideally for marine aquariums with corals the value is 7.0 to 11.0 dKH.

KH(current) = Current dKH value of aquarium water, determined by the Analysis Kit.

V(Aquarium) = Aquarium water volume expressed in liters.


Volume of water in the aquarium = 100 L

dKH determined by the Mbreda kit = 5.0 dKH

dKH intended for aquarium water = 8.0 dKH


1) Mass of Reef Basis B (g) = KH(intended) – KH(current) x V(Aquarium) x 0.0357

2) Mass of Reef Basis B (g) = (8 - 5) x 100 x 0.0357

3) Reef Basis B Mass (g) = (3) x 100 x 0.0357

4) Mass of Reef Basis B (g) = 10.71 g


Addition of 10.71 g of Reef Basis B in 100 L of water as recommended by the product.

Precision and accuracy of the KH MBreda Test Kit

Precision: 0.2 dKH +/- 3% reading

Accuracy: 0.5 dKH

Important note:

To maintain good accuracy in the tests, after each test is performed, wash the micro doser, the test tube and the syringe well with RO or distilled water (In the micro doser, fill and empty with RO water for 5 times) . The lack of cleaning will leave residues of the KH solution in the cylinder and in the plunger of the doser, consequently it may change the concentration of the solution in the next use, which may cause a margin of error in the reading of the KH concentration.

When using again, confirm that the micro doser is dry, with no splash of cleaning water.

Number of tests that can be made with the KH MBreda Test Kit:

Calculation made according to the concentration of KH and solutions available in the Kit.


Titration reagent, stabilizer, distilled water

Guidelines and Care:

Keep out of reach of children and animals.

Important: Use gloves and goggles.

Developed and manufactured by:

MBreda Indústria e Comércio Aquapaisagismo Ltda.

Mbreda Aquapaisagismo & Marinho

Mbreda is a 100% Brazilian industry that for 14 years has been manufacturing products and supplements for freshwater, reef and aquascaping.

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