| CPC C12M 21/02 (2013.01) [C12M 3/06 (2013.01); C12M 23/04 (2013.01); C12M 23/48 (2013.01); C12M 29/04 (2013.01); C12M 31/02 (2013.01); C12N 1/12 (2013.01)] | 14 Claims |

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1. A system for growing algae, comprising:
a plurality of growing trays, each of the plurality of growing trays containing growing medium for growing algae, the plurality of growing trays arranged for flow of the growing medium sequentially through the plurality of growing trays;
a holding tray receiving the growing medium from the plurality of growing trays, the holding tray configured to hold more growing medium than any one of the plurality of growing trays; and
a pump drawing the growing medium from the holding tray into the plurality of growing trays.
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