Over time the basin becomes loaded with organic matter (dead spirulina, other algae...). In order to keep a healthy growing environment, it is necessary to replace ¼ once or twice a year:
- Collect the spirulina above a tank and not above the growing tank. Thus the culture medium does not return to the pond.
- Make a new growing medium as seen in the 'growth phase' part and add it to the pond.
- Get rid of the old growing medium (undiluted it can be used as a weed killer, diluted to 10% it enriches the compost, otherwise put it in the drain).
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