The API Saltwater Calcium Test Kit provides fast, accurate titration testing to help reef keepers maintain stable calcium levels for strong coral, invertebrate and coralline algae growth. Calcium levels drop as invertebrates use calcium in aquarium water, so test weekly to monitor levels and keep your reef tank within the ideal 400–500 mg/L range.
Adequate calcium alone is not enough — coral growth is closely linked to carbonate hardness (KH), making both tests essential for healthy aquarium systems.
This kit delivers clear colour‑change results and measures levels down to 20 mg/L, making it reliable for ongoing reef maintenance.
Key Features:
Accurate titration calcium test for marine and reef aquariums
Detects calcium levels as low as 20 mg/L
Supports healthy coral, crustacean, mollusc and coralline algae growth
Clear colour‑change endpoint for easy readings
Recommended for weekly testing to maintain stable calcium in aquarium systems
