Salifert Magnesium Test Kit


2 in stock

Magnesium Test Kit

The Salifert Magnesium Test Kit measures the magnesium content in saltwater aquariums. In nature, magnesium is present in rather high concentrations such as 1300 – 1400 mg/L, and contributes heavily to photosynthesis, a process that sharply determines the growth and health of aquatic plants, algae and corals. Magnesium plays an important role in the aquarium environment. It controls and maintains the optimal balance of calcium concentration and alkalinity to ensure that the necessary and important calcium carbonates are formed naturally and not through undue chemical processes. The calcium carbonates contribute to the growth and development of corals and beneficial algae. The Salifert Magnesium Test Kit measures the amount of magnesium incrementally by 30 mg/L.

Magnesium is an essential part of chlorophyll, necessary for photosynthesis. Without photosynthesis plants, algae & corals would not be able to live.

Magnesium also makes maintaining the correct combination of calcium concentration and alkalinity or carbonate hardness possible:

Calcium forms with carbonates and bicarbonates into calcium carbonate, an important building block for corals and calcareous algae. But it should be formed by biological processes, and be deposited in the right place. Accordingly, formation of calcium carbonate by chemical processes should be avoided.

Even without biological interference calcium carbonate would be formed and would deplete calcium and alkalinity or carbonate hardness without fulfilling any function. Actually, it will scavenge many important trace elements, lowering the trace element concentration in the tank.

Magnesium slows down the process descibed above. The lower the magnesium concentration, the faster the process will take place, at a much lower calcium and alkalinity/carbonate hardness value.

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

Magnesium is depleted by algae, by the excessive use of limewater, and by going far beyond natural calcium, alkalinity and pH values.

Additionally, use of certain salts with a dramatically low magnesium content will result in permanent problems with calcium and carbonate hardness values.


  • Accurate and immediate magnesium testing kit
  • Balanced magnesium is essential for photosynthesis
  • Performs up to 50 accurate tests
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