Seachem Reef Kalkwasser 250g – Pure Calcium Hydroxide for Reef Aquariums

Seachem Reef Kalkwasser™ is an ultra-pure calcium hydroxide powder designed to prepare limewater (kalkwasser) solutions for maintaining natural seawater calcium levels in reef aquariums. Known for its exceptional purity and solubility, Reef Kalkwasser delivers consistent calcium supplementation while indirectly supporting carbonate alkalinity.

When used correctly, kalkwasser helps stabilize essential ionic balance in reef systems by replenishing calcium lost through coral growth and biological consumption. Its effectiveness depends on evaporation rate and ambient CO₂ levels, making it ideal for experienced reef keepers who want precise control over calcium dosing.

Reef Kalkwasser is an economical and reliable solution for maintaining calcium and alkalinity, especially in systems with steady evaporation. For higher demand systems, it can be safely paired with separate calcium or alkalinity supplements (not mixed directly).

Key Features:

• High-purity calcium hydroxide formula
• Used to prepare kalkwasser (limewater) solutions
• Maintains calcium at natural seawater levels
• Supports carbonate alkalinity indirectly
• Excellent solubility for consistent dosing
• Ideal for advanced reef aquarium systems
• Economical and long-lasting calcium solution
• Safe for use with separate calcium and alkalinity additives

The Seachem Reef Kalkwasser 250g is a premium, high-purity calcium hydroxide supplement for reef aquariums. Designed for kalkwasser dosing, it helps maintain stable calcium and alkalinity levels essential for coral growth. Available now at Reef Freaks, it’s a trusted solution for reef keepers seeking precision and performance.