How to Remove a Mould Smell, with Ozone, Done Properly
Ozongenerator.Nu, Editorial team · Updated 2026-06-22
A musty, damp mould odour comes from moisture and microbial activity. An ozone treatment breaks the smell molecules down rather than masking them, but it is not a substitute for fixing the problem: remove visible mould and sort out the moisture source first, otherwise the smell comes back.
Why the smell is not the same as the cause
A mould smell is a symptom of moisture. Ozone may reduce the odour, but lasting results depend on dealing with the moisture source (a leak, poor ventilation or condensation).
How to go about it
Ozone can harm the lungs and form irritating reaction products. Keep people, pets and plants out and prevent exposure in neighbouring occupied spaces. Ventilate according to verified device instructions and a site-specific risk assessment. Time passed or lack of smell does not prove safety; verify the concentration before re-entry. If that cannot be done, do not use the generator.
Which machine for which area
For single rooms or cupboards an Oxia Compact (up to 30 m²) is plenty. For a basement, a flat or larger areas the Oxia Plus (up to 100 m²) is the right choice, and for professional remediation the Oxia Pro.
Frequently asked questions
Does ozone get rid of mould?
Ozone removes the mould SMELL by breaking the odour molecules down. Visible mould you must remove mechanically, and the moisture must be fixed.
Will the smell come back?
Only if the moisture source remains. Fix the underlying cause and the room stays odour-free.
How long does a treatment take?
Ozone can harm the lungs and form irritating reaction products. Keep people, pets and plants out and prevent exposure in neighbouring occupied spaces. Ventilate according to verified device instructions and a site-specific risk assessment. Time passed or lack of smell does not prove safety; verify the concentration before re-entry. If that cannot be done, do not use the generator.
Sources & authorities
To the shop · Compare Ozone Generators: Oxia Compact, Plus & Pro · All guides