A translucent cover placed on the basin allows the culture medium's temperature to rise quickly in the morning and to keep its heat at night. A polycarbonate plate acts as a canopy. A film of greenhouse tarpaulin or food film prevents the contact between spirulina and polycarbonate whose health effects are not known.
- Make a half-rafter frame the size of the top of the basin,
- Put two central stiffeners,
- Put a bracket of about 30 cm in each corner,
- Put the greenhouse cover or the food film on one side, turn the frame and staple the plastic film on the frame,
- Make a silicone bead on the frame's contour, where the tarpaulin is stapled,
- Place the polycarbonate plate at frame size on the silicone joint,
- Screw,
- Set the hood aside to proceed to the isolation and sealing steps.
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