Reef Builder 250 g

Raises and maintains carbonate alkalinity (KH) without impacting pH. Supplies bioactive calcium, magnesium, and some trace elements for corals. Contains time-release ingredients, including chelating agents, to make essential elements biologically available. To control pH and alkalinity, use Marine Buffer, but to promote active growth of corals, use Reef Builder alone, or with Marine Buffer. 500 grams treats 8,000 gallons of saltwater.