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Here, We have chosen to grow Spirulina Plantesis because of multiple reasons. The Spirulina Plantesis is considerate as a Super Food, its popularity as an alternative source of proteins makes it a good candidate to replace usual, very expensive and unsustainable source of food.

The composition of dried Spirulina Plantesis:

65% of Proteins.
15-20% of Carbohydrates.
3-5% amino acids.

Its high content on digestible proteins enhances the idea that Spirulina Plantesis can be the future of food as a seaweed. But what can we eat in the Spirulina culture? Its Biomass, which is the amount of solid content created by photosynthesis.

To grow Spirulina Plantesis you need to understand the basis of the photosynthesis phenomenon. This micro-algae is full of chlorophyll which is a protein pigment, by fixing the CO2 and the energy of the sun, it creates the desired edible biomass. But how can we let occurs this chemical bioreaction?

By recreating the natural conditions. That why it's important to use light sources which mimic the energy of the sun and an air pump which provides enough carbon dioxide to the Spirulina to stimulates it. To mimic the source of light you can put the spirulina culture near a window to save energy, it will absorb both light and temperature from the sun. But you can also use artificial light - Preference warm light, the Spirulina absorbs easier the warm wavelength than colder ones.

Best conditions:

Optimal temperature for growth: 35°C (Under 20°C - Dormant / Dies at 40°C)
16h of Bright light + warmth
pH level: 10.5
Agitation is mostly to increase exposure to light, less for aeration

Step 1: Building the Stack

Material list:

1l bottle of freshwater
Tubing system
Led lights or warm lights
French press
Spirulina Plantesis culture
Nutrients (Bicarbonate Sodium + Phosphorus)
Timer
"T" connectors
Air Pump

Steps:

Build the frame of the algae stack - Here we chose an IKEA shelf to simplify the structure of the system.
Choose and place the number of medium you need to put in the stack
Install the air pump in the stack and link it to the bottles via PVC tubes - If you want multiple media you will need to divide the tube to provide air to all the bottles.
Put the light system next to the bottles of Spirulina to provide warmth and light to encourage the photosynthesis reaction.

Step 2: The Beginning of the Algae Culture

To begin the culture of Spirulina plantesis, we need first to get the basic components which are:

Spirulina Plantesis culture
Bicarbonate Sodium - Carbonate Sodium
Iron
Other Nutrients ( Phosphate - Nitrate)

If the conditions are optimal you will be able to harvest the Spirulina after 2 weeks - It's the time it needs to absorbs the nutrients and let occurs the photosynthesis reaction. After those few weeks, you will be able to harvest the biomass from the spirulina every 2 days (depending on the size of the medium).