How is water temperature controlled in the cold water habitats?
• Beluga habitat: A chiller is located behind the Arctic Canada Gallery. It cools both the water in the habitat and the air in the gallery, if needed. Waste heat is carried to a cooling tower, and some is used to heat the water in the Graham Amazon Gallery reservoir. How are the habitats kept clean? • Wild Coast habitat: The total volume of water in the habitat passes through one of four Vacuum Diatomaceous Earth (DE) filters or one of eight Pressure Sand Filters every 110 minutes. DE is a white, gritty powder made up of the crushed skeletons of single-celled algae. Each year, 5500 bags of DE are used, at a cost of $68,000. A small amount of chlorine is added to the water to supplement two ozonators, which kill bacteria. • Beluga habitat: The volume of water in the habitat circulates through three DE filters every 90 minutes. • Coral fishes display: Biological filters are used to reduce waste ammonia. Particulate matter and odour are removed using a mechanical filter and a layer of cha
