![Black dirt ring around water line recently showed up - Portable Hot Tubs & Spas - Pool and Spa Forum Black dirt ring around water line recently showed up - Portable Hot Tubs & Spas - Pool and Spa Forum](https://www.poolspaforum.com/forum/uploads/monthly_2021_07/IMG_0443.jpg.e1fc2cbfdd97e22f1dd3031fa525ac26.jpg)
Black dirt ring around water line recently showed up - Portable Hot Tubs & Spas - Pool and Spa Forum
Black particles in bath hot water only | Terry Love Plumbing Advice & Remodel DIY & Professional Forum
![Black dirt ring around water line recently showed up - Portable Hot Tubs & Spas - Pool and Spa Forum Black dirt ring around water line recently showed up - Portable Hot Tubs & Spas - Pool and Spa Forum](https://www.poolspaforum.com/forum/uploads/monthly_2021_07/IMG_0442.jpg.cad880ba6aa084d6a4a729e13fc6ccd3.jpg)
Black dirt ring around water line recently showed up - Portable Hot Tubs & Spas - Pool and Spa Forum
![How do I clean my tub? It's textured on the bottom and the black stains won't come out. : r/CleaningTips How do I clean my tub? It's textured on the bottom and the black stains won't come out. : r/CleaningTips](https://preview.redd.it/how-do-i-clean-my-tub-its-textured-on-the-bottom-and-the-v0-ebbx4hku5eab1.jpg?auto=webp&s=0b9383796a8c4c7e8170b719110bbb08595c9537)
How do I clean my tub? It's textured on the bottom and the black stains won't come out. : r/CleaningTips
![Black dirt ring around water line recently showed up - Portable Hot Tubs & Spas - Pool and Spa Forum Black dirt ring around water line recently showed up - Portable Hot Tubs & Spas - Pool and Spa Forum](https://www.poolspaforum.com/forum/uploads/monthly_2021_07/IMG_0445.jpg.52469f4e0010dc455b3301807e6da0b1.jpg)