Some toilets have a sink attached to the top, so that you can re-use the water in the next flush. Millions of liters of water are saved this way! : r/DesignPorn
Bleach and Urine: Safety Tips Plus Debunking the Pregnancy Test Myth
3 Ways to Dispose of Bleach - wikiHow
Are The Toilet and Shower Drains Connected?
Armitage Shanks Leven Back Inlet Slop Hopper | Commercial Washrooms
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Down the Drain Guide | SafeHome.org
Get rid of the smell under your kitchen sink | by HARI NARAYANAN V | Medium
Question about disposing of urine in sink - Ob/Gyn Nursing - allnurses
Is It Okay To Pee In A Sink? Explained - Home Hacker DIY
Is It Okay To Pee In A Sink? Explained - Home Hacker DIY