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https://www.swelluk.com:443/aqua-medic-coral-a-calcium/ 
Aqua Medic Coral A Calcium
Product Information
Provides optimum calcium content in the aquarium that can be maintained simply with Reef Life Calcium.
Dosage:
10 ml Reef Life Calcium increases the calcium content of 100 litres sea water by about 17.5 mg/l.
35 ml per week for a 100 l aquarium. Reef Life Calcium can be added automatically by using a dosing pump such as Aqua Medic Reefdoser.
Ingredients:
Calcium, potassium, magnesium, strontium