Paddle wheel aerators have been the default for decades. But as energy costs rise, more farms are switching to fine-bubble bottom aeration — and the numbers explain why.
The efficiency gap
A fine-bubble microporous system typically needs about 50% less energy than paddle wheels to reach the same dissolved oxygen level. Two reasons:
1. Transfer efficiency. Fine bubbles (20–30 µm) dissolve most of their oxygen into the water. Paddle wheels rely on surface splashing — much of the oxygen escapes back into the air.
2. Depth of mixing. Bottom aeration moves the entire water column, including the sediment layer where shrimp and fish actually live. Paddle wheels mainly aerate the surface.
Operating cost example
A 5-acre shrimp farm running paddle wheels at 7.5 kW average for 12 hours/day uses about 32,800 kWh per season. The same farm with fine-bubble aeration uses roughly 16,400 kWh. At USD 0.12/kWh, that is a saving of about USD 1,970 per season — enough to pay for the tubing in the first year.
Where paddle wheels still make sense
- Very shallow ponds (under 0.8 m) where tubing cannot be laid safely
- Emergency surface oxygenation during power outages (combined systems are common)
- Farms that already own working paddle wheels and want a low-upfront upgrade path
The hybrid approach
Most farms we work with keep one paddle wheel per 5 acres for emergencies and run fine-bubble aeration as the main system. This combines the energy savings of bottom aeration with the peace of mind of surface backup.
Our permanent-magnet VFD aerators and Roots blowers are engineered for this exact setup. Ask us for a consumption estimate based on your pond geometry.