bio x ketoSpirulina must be dried at the right temperature so that it preserves all of its nutritional qualities. In France, the two methods used for drying are dry spray and convective drying , an inexpensive and traditional method. Thanks to these two techniques, the spirulina produced is therefore of quality and the environment is preserved. Good to know: the dry spray method is described by some studies as the best in terms of preservation of nutritional qualities. The water used for spirulina production must also be clean and healthy . But how to know?