Seachem Reef Kalkwasser 250g

Product details

Seachem Reef Kalkwasser 250g (393) is a high-purity calcium hydroxide powder used to make kalkwasser (limewater) for aquarium use. In reef systems, kalkwasser helps maintain calcium concentrations near natural seawater levels by supplying calcium directly, while carbonate alkalinity can be supported indirectly. It’s commonly used in top-off water, where normal evaporation helps determine how well the solution performs. Its effectiveness also depends on CO2 concentration in the preparation/dispensing environment.

Features:

• Very pure calcium hydroxide for making kalkwasser (limewater)
• Designed to increase calcium in top-off water
• Helps maintain calcium at natural seawater levels
• Increases pH while not impacting carbonate alkalinity
• Supports carbonate alkalinity indirectly (performance depends on conditions)
• Capacity to act depends on evaporation rate and CO2 concentration
• If additional supplementation is needed, the referenced system notes pairing with separate calcium or alkalinity products rather than direct mixing with kalkwasser solution

Specifications:

• Product: Reef Kalkwasser (kalkwasser/limewater) powder
• Active ingredient: Calcium hydroxide
• Package size: 250 g (393)