The toilet water may appear brown due to minerals or sediment in the water supply, while the sink water may not have the same issue because the pipes and fixtures are different.
Grey is usually dirty water but not toilet water (shower, sink drain) Black (or Brown) is sewage from the toilet. If you have a motorhome there will be two sewage tanks... "grey" and "black"
There are a few reason why the water in a sink and toilet can be brown. It is possible that the pipes may be copper or galvanized, causing the water to change colors. Another reason may be that it is well water and it is not being filtered properly. Check with a local plumber for more options.
The integrated toilet sink combines the toilet and sink into one unit, allowing the used water from the sink to fill the toilet tank for flushing. This saves water by using it twice and also saves space in the bathroom by eliminating the need for a separate sink.
Having a toilet with a sink combined in a single unit saves space, conserves water by using the sink water for flushing, and promotes better hygiene by encouraging handwashing after using the toilet.
Call a plumber
Installing a toilet with a sink combo in a small bathroom can save space, reduce water usage, and improve hygiene by encouraging handwashing after using the toilet.
It all goes to the same treatment plant and is sent down stream to the next town or city. All tap water is the same, sink or toilet.
Sink is not vented properly and the water from the p-trap under the sink COULD be sucked out by the hydrostatic pressure from the toilet flushing.
The washer in the shut off valve has probably split or come off completely over time.
A sink to toilet grey water system collects water from sinks and showers, filters it, and then redirects it to flush toilets. This helps conserve water by reusing water that would otherwise go to waste.
It looks like a sink and toilet combined...It squirts water up ur a$$ to clean out any left overs
Installing a toilet sink combination in a small bathroom can save space, reduce water usage, and improve hygiene by allowing users to wash their hands directly over the toilet.