With the Salifert Profi Test Sr you can determine the strontium content in seawater in a easy way. Strontium plays an important role by accelerating coral and calcareous algae growth. Natural seawater contains approx. 7 - 9 mg/L strontium. Since the growth of corals and calcareous algae goes hand in hand with strontium and calcium depletion, depletion of calcium usually means depletion of strontium as well. It is advisable to maintain a strontium concentration between 5 and 20 mg/L. The Salifert strontium test kit detects both ionically free and moderately complexed strontium. Salifert was the first to introduce a strontium test kit. The Salifert Profi Test Sr -Strontium- is for approx. 25 tests in seawater. Measures in approx. 5 ppm increments.Do you have questions about this article ?