Fritz Pro Calcium Chloride is a convenient and economical professional bulk reef supplement that can be used alone or as part of a two part calcium and alkalinity supplement system to raise calcium levels in enclosed reef systems for experienced marine/reef aquarists. Fritz Pro Calcium Chloride provides supplemental calcium to reef inhabitants such as corals; snails; hard tube worms; and clams; and promotes the growth of purple; pink and green calcareous algae. Monitoring and maintaining calcium levels is an important part of helping to stabilise water chemistry values resulting in better coral; coralline algae and invertebrate growth and health. FR66020 Casebuy:6.