Somebody mentioned aquaponics. Surprised no mention of microgreens which is nutrient dense and can be done in a room or basement.
Requires nutrients. Nutrients are fertilizer. Costs money . No free lunch….
5x cost inscrease. That is only a part of the cost of food, but expect double easily by year end.
How much of the nutrients requirements is about efficiency? Tap water contains minerals.
Microgreens are not calorie dense though.
Nutrients from the talapia farm
What do you feed the fish?
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