Salifert Magnesium Test Kit The Salifert Magnesium Test Kit is a marine aquarium test kit for measuring magnesium levels in reef systems where calcium and alkalinity stability are important. Magnesium Testing for Balanced Reef Chemistry Magnesium helps support stable calcium and alkalinity levels in reef aquariums. When magnesium becomes depleted, maintaining balanced major elements can become more difficult, especially in systems with coralline algae, stony corals, kalkwasser use or elevated calcium and alkalinity demand. Salifert Magnesium Test Kit Features Measures magnesium in marine aquarium water. Measurement steps of approximately 30 mg/L. Sharp colour change supports clear endpoint reading. Results are not affected by calcium and strontium interference within normal stated ranges. Provides enough reagent for up to approximately 50 tests. Useful for reef tanks, coral systems and marine aquariums using major element supplementation. Helps troubleshoot difficulty maintaining calcium and alkalinity. Marine Use Notes This kit is for marine water. Test magnesium alongside calcium and alkalinity to get a more complete picture of major element balance before adjusting supplementation. Directions Follow the current instructions included with the test kit. Keep syringes and spoons clean, avoid reagent contamination and read the endpoint carefully under good lighting. Make magnesium adjustments gradually and retest after the aquarium has had time to mix and stabilize.