Black circle around toilet, you won’t get rid of it unless you do this | I have never had a bathroom

Causes of the Black Circle:
1. Moisture and Humidity: Bathrooms are naturally humid environments, providing the perfect breeding ground for mold and mildew. These fungi thrive in damp conditions and can form black stains over time.
2. Poor Ventilation: Inadequate ventilation can exacerbate the problem by trapping moisture in the bathroom, allowing mold and mildew to flourish.
3. Hard Water: If your water supply contains high levels of minerals like calcium and magnesium, it can lead to the formation of mineral deposits. These deposits can accumulate around the base of the toilet, contributing to the black circle.