These are N(nitrate), P(phosphorus), K(potassium), S(sulfur), Mg(magnesium), Ca(calcium), Fe(iron).
All the quantity needed is contained in urine except iron.
I thought about making a closed loop from the toilet to the spirulina ponds.
Iron can be produced at home using rusted nail, vinegar and lemon.
Also I explained how to make a micro-nutrient solution.
Maybe I should add a part concerning another way of supplying those basic fertilizers.
Here is a quick sketch to understand the process.
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