Posted in: grey stain

What is the black/grey/pink/orange slimy stuff in my home? An Introduction on Serratia Marcescens If you are experiencing black/grey/pink/orange stains or slippery residues in the shower, in a toilet, at a tap, or in the washing machine, you do not have a water quality problem, and you need not fear a health issue. These residues indicate the presence of naturally-occurring Serratia Marcescens bacteria, which are commonly...