What Are the Pink Stains in My Shower, Sink, and Toilet?

It’s a question we hear frequently, and we know there’s nothing pretty about pink when you see it stained onto the surfaces of your sink, shower, or toilet. So what’s causing these mysterious pink rings? And why does it keep coming back after you’ve scrubbed it away?

While many people believe the stains to be a sign of poor-quality or overly metallic hard water, most likely it is a bacteria known as Serratia Marcescens.