Sulfur is the fourth most abundant element present in the seawater. Correct values of this element provide corals healthy growth and vivid coloration. Research data indicates that sulfur deficiencies may worsen metabolic processes of living organisms. Sulfur is constantly consumed in the closed aquarium system and its levels should be regularly monitored.

10 ml of the product increases the sulfur level by 10 mg/l (ppm) in 100 litres (27 US gal) of water. The recommended level of sulfur in aquarium water is 810 – 990 mg/l (ppm).