Seachem Reef Kalkwasser 500g — Pure Calcium Hydroxide for Reef Calcium & Alkalinity Maintenance

Overview

Reef Kalkwasser is a high-purity calcium hydroxide designed for reef aquariums. When prepared as a limewater solution, it helps keep calcium at natural seawater levels in top-off water, supporting a stable foundation for calcifying corals and other invertebrates. Kalkwasser solutions address calcium directly while supporting carbonate alkalinity indirectly. The effectiveness of this approach depends on evaporation rates and ambient CO2 levels. If these factors limit performance, you can consider additional calcium or alkalinity supplements from Seachem—without mixing them directly into Kalkwasser solutions.

What makes Reef Kalkwasser special

• Very pure calcium hydroxide for reef use
• Ideal for increasing calcium in top-off water, helping maintain calcium levels
• Increases pH with no direct impact on carbonate alkalinity

How to use

Prepare a Kalkwasser solution to top off evaporation losses in your reef tank. The rate at which calcium is maintained depends on evaporation and CO2 concentration; higher CO2 can reduce pH stability. If calcium or alkalinity reach stability challenges, you can add compatible supplements—such as Reef Advantage Calcium, Reef Complete, or Reef Calcium for calcium, along with Reef Builder or Reef Carbonate for alkalinity—without mixing them directly into Kalkwasser.

• Top-off dosing tips: establish a steady evaporation rate, then dose Kalkwasser gradually to maintain calcium levels.
• Combination guidelines: use Kalkwasser as a calcium source and add compatible calcium or alkalinity supplements as needed, separately from Kalkwasser.

Notes and considerations

Performance will vary with system factors like evaporation and CO2. If you need additional calcium or carbonate alkalinity, consider the Seachem Reef family supplements as complementary options, ensuring you do not mix these products directly with Kalkwasser solutions.