Pink Mould in Shower: What It Is and How to Remove It

That pink or salmon-coloured slime forming around your shower drain, on grout lines, or along shampoo bottles isn’t actually mould at all — it’s a bacteria called Serratia marcescens. But just because it’s bacterial doesn’t mean you should ignore it.

Why Pink “Mould” Appears

Serratia marcescens feeds on fatty residues from soap, shampoo, and body oils. It loves warm, wet environments — making your shower the perfect breeding ground. Adelaide’s coastal suburbs often see worse pink bacteria growth due to higher ambient humidity.

Is Pink Mould Dangerous?

While less dangerous than true moulds like Stachybotrys, pink bacteria can cause urinary tract infections, wound infections, and respiratory problems in vulnerable people. If you have young children or elderly family members, it’s worth taking seriously.

How to Remove and Prevent It

Unlike true mould, pink bacteria responds well to regular cleaning with a solution of baking soda and dish soap, or a diluted bleach spray. The key is prevention: squeegee shower walls after use, ensure your bathroom exhaust fan runs for 15 minutes after showering, and address any condensation issues.

If pink bacteria keeps returning despite regular cleaning, it may indicate a ventilation problem. A professional inspection can assess your bathroom’s airflow and recommend improvements.