Aeration of sea water with three different aeration devices at the same air flow rate (1 L/min.)
Porous resin airstone
Mili-bubbles are released from innumerous fine pores with about 150 µm of the airstone made of resins, and rise up in the water vigorously.
Micro-bubble diffuser
Fine bubbles of 100 to 500 µm are released from the porous ceramic plate, but go up toward the water surface rapidly.
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Micro-bubbles (referred to as fine bubbles of less than 50 µm of diameter) tend to be suspended in the water for a long time due to extremely low buoyancy.
DDHRS Nozzle of eco-Bubble® can create not only micro-bubbles (approximately 14 µm of mean diameter) but also nano-bubbles (approximately 0.2 µm of mean diameter) at the same time (Hu & Xia (2018)).
Remarks) The sizes of the bubbles released from the nozzle changes markedly, depending on the water conditions.