Major elements: calcium, alkalinity and magnesium

Calcium, alkalinity and magnesium are the majors most reef keepers track. They move together: chasing one number without watching the others usually creates a new problem a week later.

Liquid major-element supplements suit regular top-ups between water changes. Powder options suit Balling-style or kalkwasser workflows. Either way, dose to measured need and keep a simple log so results stay repeatable.

Browse the major elements and powder supplements ranges for the bottles that match your method.