Royal Nature Magnesium Professional Test Kit

Aqua Premium

Availability: 1 in stock

Test Instructions - 2 steps only


Each kit will give you 50 tests.

We recommend doing the Calcium test first.

  1. Using the 2.5 ml syringe add only 2 ml of Mg-1 to the test vial.
  2. Add one flat 0.15 ml scoop of Mg-2 powder to the test vial and swirl.
     • The solution should appear this color       
  3. Using the 1 ml syringe, place the metal needle firmly and draw up the aquarium water until the lower end of syringe's black rubber is right on the 1.00 ml mark. Before this step, ensure that the needle is empty of liquids and that it's submersed in water the entire time to avoid air entering to the syringe.
     • The presence of a layer of air between the liquid and the black part of syringe is normal and will not affect the result. (The normal air layer you should see is equal to 0.1 ml.)
  4. Begin adding aquarium water to the test vial one drop at a time, swirling a little after each drop until the solution appears this color       

    Attention: before any use of the vial test, make sure it is washed with RO water only and dry it up with a soft paper.
    • If the solution in the test vial does not reach this color and you have used all the aquarium water in the syringe, return back to step 3 (It means that concentration of magnesium is below 970ppm).
    • If after adding another 1.00 ml of water a second time, the color is not changed this means the concentration of magnesium is below 360ppm.

    Faster test can be achieved without the metal needle with a potential mistake of 2%.
  5. Note the position of the lower black part of syringe (each division corresponds to 0.01 ml) and obtain the magnesium concentration from Table 1. Readings should be taken at the position of the lower end of syringe's black rubber.
    • If you needed to return to step 3 a second time then use Table 2 to obtain the magnesium concentration.
    The normal concentrations for magnesium are between 1280-1540 ppm (salinity related).


The result is accurate when the concentration of calcium is between 350-450ppm. If the concentration of calcium is not in this range then you can correct the result from this table:


NSW Magnesium is around 1350. Our recommendation is to keep Magnesium levels in the tank between: 1290-1450 PPM. In case of low Magnesium use Royal Magnesium Chloride in powder or liquid to keep parameters between: 1290-1450 PPM.