Kalkwasser Supplement (Calcium Hydroxide) Reef Tank Additive SR Aquaristik 6.6lb
Instructions for use: Add 5-10ml or 1-2 teaspoons of Calcium Hydroxide to a clean, dry 1 gallon container. Fill the container about ¾ full with RO/DI or filtered water; shake vigorously for about 2 minutes.