Fig. 1

The schematic of BTFs. (1) Air compressor, (2) (3) syringe pump, (4) (5) mixing chamber, (6) (7) three-way valve, (8) (9) nutrient-holding tank, (10) (11) peristaltic pump
The schematic of BTFs. (1) Air compressor, (2) (3) syringe pump, (4) (5) mixing chamber, (6) (7) three-way valve, (8) (9) nutrient-holding tank, (10) (11) peristaltic pump