Colombo Marine Pro Reef Salt 22KG BucketBecause of its origin, Colombo Pro Reef Salt differs substantially from most other salts for reef aquariums. More and more hobbyists understand the benefits of a natural product compared to a chemically enhanced product. With the minimum of chemical or technical modifications, Colombo Pro Reef salt comes the closest to natural seawater. At least 85% of the ingredients are harvested from natural seawater by environmentally friendly solar evaporation.