Compare nanobubbles with the alternatives

What each comparison covers

The four pages are not variations on the same argument. Each one is about a different kind of question, and it is worth knowing which question you are asking before you start reading.

• Nanobubbles vs chlorine — the baseline comparison. Chlorine is the cheapest, best-understood disinfectant in the industry and it leaves a residual in the basin, which is exactly what a public pool needs. This page is about what chlorine produces once it meets bather load, and what changes if you take that reaction away.
• Nanobubbles vs UV — a comparison about where disinfection happens. UV works inside the reactor and is excellent at destroying chloramines that already exist. It leaves nothing behind in the basin. The real question is usually whether to run both rather than which to choose.
• Nanobubbles vs salt chlorinators — mostly a page about a misconception. A salt system makes chlorine on site by electrolysis, so a salt pool is a chlorine pool. That is a genuine convenience and safety improvement, and it is not the same thing as going chlorine-free.
• Nanobubbles vs ozone — the least adversarial of the four, because ozone is a chemistry and nanobubbles are a delivery method. The comparison is really about transfer efficiency and gas handling, and the honest answer is often to use both.

The four alternatives at a glance

The table below is a routing aid, not a verdict. Every row simplifies a page that deserves reading in full, and the rightmost column is the one worth taking seriously — each of these methods is the correct choice for some buildings.

Method	What it actually is	Residual in the basin	Chloramines	Where it wins
Chlorine	A dosed chemical disinfectant	Yes	Forms readily	Lowest cost, best understood, and the residual regulations usually require
UV	Light inside a reactor	None	Destroys existing ones	Fixing hall air quality in an existing chlorinated pool
Salt chlorinator	Chlorine generated on site from salt	Yes	Still forms	No chemical drums to store or handle; softer-feeling water
Ozone	A powerful oxidant that reverts to oxygen	None	Prevents formation	Heavy organic load and high clarity demands
Nanobubbles	A gas delivery method, carrying oxygen or ozone	None on its own	Prevents formation	Where chemical cost, air quality and bather comfort all carry weight

Running cost, payback and suitability all depend on bather load, water temperature, turnover rate and how the plant is operated. Ask any supplier — including us — for figures worked against your own pool volume rather than a generic table.

Which page should you read first?

The fastest route through this section is to start from what is in your plant room today rather than from what you might buy.

• Dosing chlorine and the hall smells — start with Nanobubbles vs chlorine.
• Already running a lamp bank and wondering whether it is enough — Nanobubbles vs UV.
• Sold a salt system as chlorine-free — Nanobubbles vs salt chlorinators.
• Costing up an ozone plant, or already running one — Nanobubbles vs ozone.
• Still at the stage of weighing everything at once — the chlorine-free pool guide compares all five methods side by side, including costs and the rules that apply in Norway.

What all four pages have in common

One limit applies to nanobubbles in every one of these comparisons, so it is worth stating once here. This is a treatment-loop technology: it acts on water passing through the system, it is sized on flow rate, and on its own it leaves no lasting disinfectant residual in the basin. Where regulations require a residual — which in Norway is normally the case for a public pool — the realistic outcome is heavily reduced chlorine rather than none.

That is the same limit UV and ozone carry, and none of the four pages pretends otherwise. If a supplier tells you their treatment-loop product removes the residual requirement, ask them to show you where the regulation says so.