Fritz Pro Sodium Bicarbonate 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 alkalinity levels in enclosed reef systems for experienced marine/reef aquarists. Monitoring and maintaining alkalinity is an important part of helping to stabilize water chemistry values; resulting in better coral; coralline algae; and invertebrate growth and health. FR69640 Casebuy:1.