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Here is how I prefer growing bacterial cellulose. The recipe is based on a cc-licensed recipe from biocouture, but I have done several modifications. The recipe can be scaled.
Use a container of class or plastic (no metal) The cellulose will take the shape of the container.
1 l water: I used tempered tap water, but depending on your water it may be wise boiling the water. Optimal growing temperature around 27-30° Celsius.
100g nutrition: The bacteria can eat Glucose, fructose og glycerol. This means you can add various types of fruit, vegetable, sugar or even grass. The choose of nutrition affect the speed of the growth, the material properties and look.
1dl vinegar/reuse of last brewing: My experience indicate that the cellulose grows best in a pretty acidic liquid (PH value around 3). Add some strong vinegar for your first brewing. The bacteria creates vinegar as a bi-product, so for your next brewing, you can simply reuse about 1/10 of the water.
*1 SCOBY starter culture: (click here to see where you can get one) You will only need one for your first brewing. Afterwards there will be sufficient of bacteria living in the water you reuse from previous brewing.
Keep the container in room temperature, away from directly sunlight. For quick growth optimal temperature should be around 28ºC. Do not shake the container after the growth has started. To avoid fruit flies, cover it with a textile. The culture needs oxygen to grow.