ESV B-Ionic Strontium (20% Strontium Chloride Solution) 8 fl. oz. offers a concentrated and highly soluble solution of inorganic strontium chloride, designed to effectively maintain optimal levels of dissolved strontium in marine aquariums. This pure and phosphate-free formula ensures the integrity of aquatic environments, supporting the health and growth of marine organisms dependent on strontium. While beneficial for aquarium health, it's important to monitor alkalinity levels as prolonged use may lead to a decrease.