With the Salifert Profi Test B you can determine the boron content in seawater exactly and easily. Natural seawater contains approx. 4.4 - 4.8 mg/l boron. Which is also the value we should strive for in the aquarium. The Salifert Profi Test B -Boron- can perform approx. 25 measurements in marinewater. The pH value must be between pH 8.0 and 8.6 during the test. Do you have questions about this article ?