Harvesting of Haematococcus is carried out by a two-stage process – sedimentation and centrifugation. Sedimentation is the process of allowing algae to settle to the bottom. The technique is carried out in large stabilization ponds, where the algae is allowed to settle.
One of the hindrances to efficient sedimentation in continuous production systems could be the mixing provided for better nutrient circulation, which prevents effective sedimentation. This however might not be a problem in batch cultivation, where the mixing process could be halted during the sedimentation process.
After sedimentation, the algae is centrifuged to remove excess water and made into algae paste.