JBL Test Potassium (K)

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JBL Test Potassium (K)


Set of 25 tests for fresh and salt water.

The JBL K Test-Set Kalium routinely measures and checks the potassium content in fresh aquarium water between 2 and 15 mg/l (ppm).

In seawater, the potassium content is in the range of about 390-400 mg / l and is consumed only in small quantities.

Too high potassium values represent a risk for sensitive animals such as shrimp.


Potassium is one of the macronutrients that is rapidly and efficiently (within a few hours) absorbed by plants in fresh water and stored for some time.


Growing plants require more potassium than other nutrients. Potassium can therefore drop to a minimum quickly, despite regular (eg weekly) fertilization of the aquarium water. This stops the growth of plants.

In tap water, potassium is a deficient element compared to the natural environment, especially compared to calcium and magnesium.

We recommend that you start by measuring the potassium content in your aquarium every day. In this way, you can precisely determine the needs of the plants and dose the fertilization accordingly.

Over time, you can move on to routine checkups at longer intervals.


For good growth and development of plants, the potassium value should be between 5 and 10 mg / l.

In aquariums with intense lighting, from about 1 W / l, the potassium content should be in the range of 10 to 20 mg / l.

Higher potassium values favor the growth of undesirable green flagellated algae.

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