Colombo Magnesium Marine Test Kit (Best Before Date September 2025)

Magnesium (Mg)
General Guidelines
• Ensure that the test tube is clean before use.
• Clean the tube directly after use.
• Take the volume of the water sample as precisely as possible.
• Keep the dripping bottle perfectly vertical during dropping.
• Take care that no air bubbles are included in the drops.

Test procedure:
1. Take a water sample of 2 ml.
2. Add 5 drops of Mg-1 fluid and shake the tube for 20 seconds.
3. Add 5 drops of Mg-2 fluid and shake the test tube; the water sample becomes dark red - red purple of colour.
4. Mount the plastic tip onto the 1 ml syringe and fill the syringe with Mg-3 test fluid. Above the fluid an air bubble will appear, this is normal. The air compensates for the volume in the tip. Add the fluid slowly until the sample colours blue.
5. The number of ml what was needed to let the colour convert from red/purple to blue gives the Magnesium content according to the information in the chart below.
You can also calculate the Magnesium content by multiplying the qty of ml by 1.500.E.g. 0,8 ml needed to convert from Red / Purple to Blue = 0,8 x 1.500 = 1.200 mg Magnesium per litre.