Waterbox Aquariums
Core Elements Pack CAL/ALK/MAG
Estimated Shipping & Lead Times
In Stock Aquariums: Typically ship in 1–3 business days.
Backordered systems: Most orders ship within 4–6 weeks, though some may ship sooner depending on inbound inventory.
Estimates are based on business days and may vary during holidays, carrier capacity surges, weather, or port/cargo delays. You’ll receive tracking as soon as your items depart. Some orders may ship in multiple boxes or partial shipments.
See our home delivery options in our Shipping Policy.
The Core Elements bundle includes all 3 major elements, Calcium, Alkalinity and Magnesium.
For use with saltwater reef aquariums
Calcium
Calcium is an essential building block for coral skeletons, invertebrates, and coralline algae in a reef aquarium. If calcium levels are not maintained properly, LPS and SPS coral cannot grow their calcium carbonate skeletons. Recommended Levels 420-460 ppm
Instructions: 5 ml of Calcium will raise calcium level by 7.5 mg/l (ppm) in 100 L (25 gal)
Alkalinity
Alkalinity is one of the most important elements in a reef aquarium. It is an essential building block for coral skeletons and a crucial part in maintaining stable pH. Recommended Levels 7.5-9.5 dKH
Instructions: 5 ml of Alkalinity will raise dKH level by 0.125 dKH in 100 L (25 gal)
Magnesium
Magnesium maintained at proper levels allows for increased absorption of calcium and alkalinity. This increases growth and overall health of reef inhabitants. Recommended Levels 1200-1400
Instructions: 5 ml of magnesium will raise magnesium level by 3.75 mg/l (ppm) in 100 L (25 gal)