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Salifert Magnesium Test Kit

Salifert Magnesium Test Kit

SKU: T817

Testing for magnesium (Mg) is crucial in aquarium maintenance, as it plays a vital role in chlorophyll formation for photosynthesis, supporting the life of plants, algae, and corals. Magnesium also facilitates the proper balance between calcium concentration and alkalinity, essential for coral and calcareous algae growth. The Salifert Magnesium Test Kit offers a straightforward method, providing accurate measurements in 30 mg/L increments with a distinct color change, ensuring precise readings. With the capability to perform around 50 measurements, it enables aquarists to maintain optimal magnesium levels. Additionally, Salifert's liquid-magnesium additive ensures system balance without disruption, offering an ultra-pure solution for magnesium supplementation, while the Magnesium-powder provides a cost-effective option for major corrections.

Salifert Magnesium Test Kit


Do you test for Mg? Magnesium is an essential part of chlorophyll, which is necessary for photosynthesis. Without photosynthesis plants, including algae and the corals, which we usually have in our aquariums, would not be able to live.

Magnesium has another important function since in fact makes maintaining the correct combination of calcium concentration and alkalinity or carbonate hardness possible.

Maintaining a correct magnesium concentration is therefore very important and is indirectly responsible for fast coral and calcareous algae growth by virtue of making the maintenance of correct calcium and alkalinity figures possible.

The Salifert magnesium test is very straightforward and does not suffer from calcium and strontium interferences when within certain bounds. It measures in sufficient accurate steps of 30 mg/L with a sharp color change. The kit can perform approx. 50 measurements.


The Salifert liquid-magnesium additive does not imbalance the system and is ultra pure. Salifert was the first in offering such an additive. A more economical version suitable for a one time major correction is the Salifert Magnesium-powder.

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