Seachem Reef Kalkwasser – High-Purity Calcium Hydroxide (500g)

Seachem Reef Kalkwasser is a laboratory-grade calcium hydroxide supplement designed to maintain calcium concentrations at natural seawater levels. It is ideal for reef aquariums where corals and other calcifying organisms require consistent calcium availability for skeletal growth.

Kalkwasser (limewater) solutions made with Reef Kalkwasser also help stabilize pH and indirectly support carbonate alkalinity. This makes it a powerful and economical solution for reef keepers using auto top-off (ATO) systems or drip dosing methods.

Key Features:

– Pure calcium hydroxide with exceptional solubility
– Maintains calcium directly and alkalinity indirectly
– Raises pH to 8.3 without affecting carbonate levels
– Ideal for reef aquariums with high calcium demand
– Suitable for use in ATO systems and manual drip dosing

Product Specifications:

Brand: Seachem
Weight: 500 g
Form: Powder
Country of Origin: United States

Directions for Use:

Never add directly to the tank. Dissolve 3 g (1 teaspoon) in 4 L (1 US gallon) of freshwater. For a fully saturated solution, use 6 g (2 teaspoons) per 4 L. Drip the clear supernatant into the aquarium. Do not allow undissolved material to enter the tank. Monitor pH and alkalinity regularly. Ideal pH range: 8.3–8.4.