... or granular crystal introduction:sodum percarbonate, has another name, sodium carbonate peroxyhydrate, and always be called with the abbriviation, ... types, but the mainly two type is sodium percaonte uncoated, and sodium percarbonate coated;uncoated type, usually applied for ... oxygen to shrimps and fishes. coated, commonly used for detergent industry.Features1. it is non-toxic, odorless, no polluting ...