---
title: "Nanobubbles vs aeration: what each one does | Alchemal"
url: "https://alchemal.com/technology/nanobubbles-vs-aeration/"
description: "An aerator's bubbles surface in seconds and give most of their oxygen to the air. Nanobubbles stay suspended for weeks. Where each one fits."
source: "Alchemal — alchemal.com"
---
# Nanobubbles vs your aerator: what each one does

An aerator's bubbles are millimeters wide: they surface in seconds and hand most of their oxygen back to the air. Nanobubbles are roughly 2,500 times smaller, neutrally buoyant, and stay suspended for weeks, so oxygen reaches the deep water and sediment your aerator never touches. Both have real uses; the difference is depth.

## What an aerator's bubble does

A bubble from a diffuser or fountain is millimeters wide. At that size it's strongly buoyant: it rockets to the surface in seconds and hands most of its oxygen back to the air instead of the water. A fountain oxygenates the water it can throw, and only that water. In shallow water, that can be enough. In anything deep enough to stratify, the bottom layer never sees it.

## What a nanobubble does instead

Nanobubbles are roughly 2,500 times smaller than a grain of salt: small enough to be neutrally buoyant. They don't race to the surface; they stay suspended for weeks, dissolving their oxygen throughout the column, including at the sediment interface where the conditions behind algae, odor, and fish loss actually form.

## What we concede, every time

- A fountain is beautiful, and it genuinely disturbs the surface: a real benefit against mosquitoes that our system does not provide.
- A diffuser is cheap, and better than nothing in shallow water.
- Sometimes the right system includes them. We'll say so in the plan.

What surface equipment cannot do is restore conditions at depth, and that's where every problem on our [map](https://alchemal.com/problems/) begins. If your aerator was running during a fish kill, this is why: the crash formed below the water it could reach.

## The numbers, carefully

Published research reports substantially higher oxygen-transfer efficiency for very small bubbles than for conventional aeration. Here is a specific, checkable instance rather than a loose "studies show":

In a bench-scale comparison, micro-nano bubble aeration roughly doubled standard oxygen-transfer efficiency against conventional aeration under the same conditions, reaching about 54% at its best operating point.

[Kizhisseri, Sakr, Maraqa and Mohamed, *Heliyon*, 2025](https://doi.org/10.1016/j.heliyon.2025.e41687)

A 25 L bench test in clean water. It shows the mechanism's headroom, not what any installed unit delivers to a real pond.

Now the part most spec sheets skip: a laboratory percentage is not a promise about your water. Transfer efficiency in the field depends on depth, temperature, load, and the machine actually installed. This category's habit is to print a headline efficiency figure with no per-install data behind it, which is part of how it earned skeptical regulators. Our own units' transfer figures will publish with clean-water test results to the recognized standard, ASCE/EWRI 2-06, cited, or they will not publish. Every installation is instrumented from day one, and each unit meters the oxygen it delivers against the change the water shows; [how we measure](https://alchemal.com/technology/how-we-measure/) is already public.

## Tell us what your water is doing.

A specialist reads your description and replies in writing: what it usually means and what we would measure first.

[Get a free assessment](https://alchemal.com/assessment/)