A simple nutrient feed for growing Spirulina is:

Baking soda - NaHCO3 - 16 g/L = 60.56 g/gal

Potassium nitrate - KNO3 - 2 g/L = 7.57 g/gal

Sea salt - NaCl - 1 g/L = 3.78 g/gal

Potassium phosphate - KH 2 PO 4 - 0.1 g/L = .378 g/gal

Iron sulphate - FeSO4 * 7H2O - 0.01 g/L = .0378 g/gal

which can all be found in aquarium or else in the agricultural division, all commonly occurring compounds except for the FeSO4. The algae have actually been tested and successfully grown in human urine at 1:180 parts. After 7days, 97% of NH4+-N, 96.5% of total phosphorus (TP) and 85–98% of urea in the urine (ca. 120-diluted) were removed by the microalgae under autotrophic culture (30 °C).

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