Sink stain emanating from overflow hole
 

This isn't a problem I need to fix, just a curiosity I wonder about.

We have a sink that is used lightly. It never has the stopper in, it is never filled, there is never a reason for it to have water enter the overflow. The overflow hole is on the near side, the faucets on the far side.

And yet, it has developed a tan stain obviously starting at the overflow and extending down towards the drain.

I don't see any sign water has ever come out of the overflow, nor do I see why that would happen, but there has to be some reason for this.

Sink stain emanating from overflow hole
 

On 8/1/2020 9:17 AM, TimR wrote:
This isn't a problem I need to fix, just a curiosity I wonder about.

We have a sink that is used lightly. It never has the stopper in, it is never filled, there is never a reason for it to have water enter the overflow. The overflow hole is on the near side, the faucets on the far side.

And yet, it has developed a tan stain obviously starting at the overflow and extending down towards the drain.

I don't see any sign water has ever come out of the overflow, nor do I see why that would happen, but there has to be some reason for this.

Probably fumes from the trap and drain system. Put some water down it
and flush it out and it may help.

Sink stain emanating from overflow hole
 

"Ed Pawlowski" wrote in message
...
On 8/1/2020 9:17 AM, TimR wrote:
This isn't a problem I need to fix, just a curiosity I wonder about.

We have a sink that is used lightly. It never has the stopper in, it is
never filled, there is never a reason for it to have water enter the
overflow. The overflow hole is on the near side, the faucets on the far
side.

And yet, it has developed a tan stain obviously starting at the overflow
and extending down towards the drain.

I don't see any sign water has ever come out of the overflow, nor do I
see why that would happen, but there has to be some reason for this.

Probably fumes from the trap and drain system.

Unlikely to be fumes if the stain is where liquid would run.

Put some water down it and flush it out and it may help.

Sink stain emanating from overflow hole
 

In article ,
TimR wrote:

This isn't a problem I need to fix, just a curiosity I wonder about.

We have a sink that is used lightly. It never has the stopper in, it is
never filled, there is never a reason for it to have water enter the
overflow. The overflow hole is on the near side, the faucets on the far
side.

And yet, it has developed a tan stain obviously starting at the overflow and
extending down towards the drain.

I don't see any sign water has ever come out of the overflow, nor do I see
why that would happen, but there has to be some reason for this.

Could you have a lizard or insect that comes out at night?

Fred

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Sink stain emanating from overflow hole
 

On 8/1/2020 4:07 PM, %% wrote:


"Ed Pawlowski" wrote in message
...
On 8/1/2020 9:17 AM, TimR wrote:
This isn't a problem I need to fix, just a curiosity I wonder about.

We have a sink that is used lightly.Â* It never has the stopper in, it
is never filled, there is never a reason for it to have water enter
the overflow.Â* The overflow hole is on the near side, the faucets on
the far side.

And yet, it has developed a tan stain obviously starting at the
overflow and extending down towards the drain.

I don't see any sign water has ever come out of the overflow, nor do
I see why that would happen, but there has to be some reason for this.

Probably fumes from the trap and drain system.

Unlikely to be fumes if the stain is where liquid would run.

Put some water down it and flush it out and it may help.


WTF do you think is happening in that drain? You wash down all sort of
caustic and organic materials and they sit in the trap where that
overflow connects. Some washes back in the bottom of it. sits and
oxidizes. Then it gives off gasses that rise and coat things.

Sink stain emanating from overflow hole
 

"Ed Pawlowski" wrote in message
...
On 8/1/2020 4:07 PM, %% wrote:


"Ed Pawlowski" wrote in message
...
On 8/1/2020 9:17 AM, TimR wrote:
This isn't a problem I need to fix, just a curiosity I wonder about.

We have a sink that is used lightly. It never has the stopper in, it
is never filled, there is never a reason for it to have water enter the
overflow. The overflow hole is on the near side, the faucets on the
far side.

And yet, it has developed a tan stain obviously starting at the
overflow and extending down towards the drain.

I don't see any sign water has ever come out of the overflow, nor do I
see why that would happen, but there has to be some reason for this.

Probably fumes from the trap and drain system.

Unlikely to be fumes if the stain is where liquid would run.

Put some water down it and flush it out and it may help.


WTF do you think is happening in that drain?

Most likely something like emptying the bath
is producing a surge up the drain which sees
some dirty water from the drain coming out
the overflow and its that the stains the sink.

You wash down all sort of caustic and organic materials

Its less clear that that is happening
much with that infrequently used sink.

and they sit in the trap where that overflow connects. Some washes back
in the bottom of it. sits and oxidizes. Then it gives off gasses that
rise and coat things.

But gases dont come out the overflow and move down to the drain.

Sink stain emanating from overflow hole
 

On 8/1/2020 5:12 PM, %% wrote:


"Ed Pawlowski" wrote in message
...
On 8/1/2020 4:07 PM, %% wrote:


"Ed Pawlowski" wrote in message
...
On 8/1/2020 9:17 AM, TimR wrote:
This isn't a problem I need to fix, just a curiosity I wonder about.

We have a sink that is used lightly.Â* It never has the stopper in,
it is never filled, there is never a reason for it to have water
enter the overflow.Â* The overflow hole is on the near side, the
faucets on the far side.

And yet, it has developed a tan stain obviously starting at the
overflow and extending down towards the drain.

I don't see any sign water has ever come out of the overflow, nor
do I see why that would happen, but there has to be some reason for
this.

Probably fumes from the trap and drain system.

Unlikely to be fumes if the stain is where liquid would run.

Put some water down it and flush it out and it may help.


WTF do you think is happening in that drain?

Most likely something like emptying the bath
is producing a surge up the drain which sees
some dirty water from the drain coming out
the overflow and its that the stains the sink.

You wash down all sort of caustic and organic materials

Its less clear that that is happening
much with that infrequently used sink.


Key word -- infrequently
Dirty water sits and rots.

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Sink stain emanating from overflow hole
 

"Ed Pawlowski" wrote in message
...
On 8/1/2020 5:12 PM, %% wrote:


"Ed Pawlowski" wrote in message
...
On 8/1/2020 4:07 PM, %% wrote:


"Ed Pawlowski" wrote in message
...
On 8/1/2020 9:17 AM, TimR wrote:
This isn't a problem I need to fix, just a curiosity I wonder about.

We have a sink that is used lightly. It never has the stopper in, it
is never filled, there is never a reason for it to have water enter
the overflow. The overflow hole is on the near side, the faucets on
the far side.

And yet, it has developed a tan stain obviously starting at the
overflow and extending down towards the drain.

I don't see any sign water has ever come out of the overflow, nor do
I see why that would happen, but there has to be some reason for
this.

Probably fumes from the trap and drain system.

Unlikely to be fumes if the stain is where liquid would run.

Put some water down it and flush it out and it may help.


WTF do you think is happening in that drain?

Most likely something like emptying the bath
is producing a surge up the drain which sees
some dirty water from the drain coming out
the overflow and its that the stains the sink.

You wash down all sort of caustic and organic materials

Its less clear that that is happening
much with that infrequently used sink.


Key word -- infrequently
Dirty water sits and rots.

But doesnt move out the overflow down to the drain.

Sink stain emanating from overflow hole
 

On Saturday, August 1, 2020 at 7:24:57 PM UTC-4, %% wrote:

Probably fumes from the trap and drain system.

Unlikely to be fumes if the stain is where liquid would run.

Put some water down it and flush it out and it may help.


WTF do you think is happening in that drain?

Most likely something like emptying the bath
is producing a surge up the drain which sees
some dirty water from the drain coming out
the overflow and its that the stains the sink.

You wash down all sort of caustic and organic materials

Its less clear that that is happening
much with that infrequently used sink.


Key word -- infrequently
Dirty water sits and rots.

But doesnt move out the overflow down to the drain.

The stain is exactly where liquids would flow and shaped like they would be..

But it's hard to see a backup happening out the overflow that didn't also show at the drain.

I thought of fumes, but they would have to be heavier than air.

I scrubbed it off this morning, too late for a photo. If it recurs I'll do that. This is the sink I use to brush my teeth, I don't think wife or daughters ever use it, certainly not on a regular basis. So it gets about one drinking glass of water per day, but that's every day.

On the other hand. About ten years ago I replaced the faucets in that sink.. I don't remember why but I wouldn't have done that job without a darned good reason. I do remember the old ones didn't want to come out, I think I beat on them with a rubber hammer for a long time before they moved. I had to pull the sink from the vanity into the backyard to get it apart.

So it's not impossible I screwed something up when I replaced it. But it hasn't backed up or dripped underneath, so I can't have done too badly.

Sink stain emanating from overflow hole
 

"TimR" wrote in message
...
On Saturday, August 1, 2020 at 7:24:57 PM UTC-4, %% wrote:

Probably fumes from the trap and drain system.

Unlikely to be fumes if the stain is where liquid would run.

Put some water down it and flush it out and it may help.


WTF do you think is happening in that drain?

Most likely something like emptying the bath
is producing a surge up the drain which sees
some dirty water from the drain coming out
the overflow and its that the stains the sink.

You wash down all sort of caustic and organic materials

Its less clear that that is happening
much with that infrequently used sink.


Key word -- infrequently
Dirty water sits and rots.

But doesnt move out the overflow down to the drain.

The stain is exactly where liquids would flow and shaped like they would
be.

Thats the crucial detail that needs to be explained.

But it's hard to see a backup happening out the overflow that didn't also
show at the drain.

That might well be due to how the overflow comes into
the drain before where the plug goes in the drain hole.

I thought of fumes, but they would have to be heavier than air.

And wouldnt produce a stain that looks like liquid
running down. The stain would be much wider and
less defined even if the fumes were heavier than air.

I scrubbed it off this morning, too late for a photo.
If it recurs I'll do that. This is the sink I use to brush
my teeth, I don't think wife or daughters ever use it,
certainly not on a regular basis. So it gets about one
drinking glass of water per day, but that's every day.

Since you never put the plug in and never fill it, I'd
block the overflow with something and see the stain
never show up again and then block it permanently
but so that the block can be removed if you sell the
place or start using it as a filled sink again later etc.

On the other hand. About ten years ago I replaced the
faucets in that sink. I don't remember why but I wouldn't
have done that job without a darned good reason.

The usual reason is because you cant stop it dripping
and cant work out how to replace the washer seat etc.

I do remember the old ones didn't want to come
out, I think I beat on them with a rubber hammer
for a long time before they moved.

Yeah, they can seize quite easily with some poor
designs with no way to get enough leverage.

I had to pull the sink from the vanity
into the backyard to get it apart.

So it's not impossible I screwed
something up when I replaced it.

Yeah, maybe so a backup ends up with enough
backing up the overflow to be enough to stain
the sink with that dirty backup.

But it hasn't backed up or dripped underneath,
so I can't have done too badly.

But might have ended up with some sealant etc
that you used to stop it dripping redirecting a
backup up the overflow accidentally.

Sink stain emanating from overflow hole
 

On 8/1/2020 5:37 PM, TimR wrote:
On Saturday, August 1, 2020 at 7:24:57 PM UTC-4, %% wrote:

Probably fumes from the trap and drain system.

Unlikely to be fumes if the stain is where liquid would run.

Put some water down it and flush it out and it may help.


WTF do you think is happening in that drain?

Most likely something like emptying the bath
is producing a surge up the drain which sees
some dirty water from the drain coming out
the overflow and its that the stains the sink.

You wash down all sort of caustic and organic materials

Its less clear that that is happening
much with that infrequently used sink.


Key word -- infrequently
Dirty water sits and rots.

But doesnt move out the overflow down to the drain.

The stain is exactly where liquids would flow and shaped like they would be.

But it's hard to see a backup happening out the overflow that didn't also show at the drain.

I thought of fumes, but they would have to be heavier than air.

I scrubbed it off this morning, too late for a photo. If it recurs I'll do that. This is the sink I use to brush my teeth, I don't think wife or daughters ever use it, certainly not on a regular basis. So it gets about one drinking glass of water per day, but that's every day.

On the other hand. About ten years ago I replaced the faucets in that sink. I don't remember why but I wouldn't have done that job without a darned good reason. I do remember the old ones didn't want to come out, I think I beat on them with a rubber hammer for a long time before they moved. I had to pull the sink from the vanity into the backyard to get it apart.

So it's not impossible I screwed something up when I replaced it. But it hasn't backed up or dripped underneath, so I can't have done too badly.


If you have the bowl filled with water and suddenly open the drain, the
pressure of the water at the drain will surge water into the overflow
drain tube, perhaps enough to splash some out through the drain hole or
above it where it can then run down and out.

Sink stain emanating from overflow hole
 

"Bob F" wrote in message
...
On 8/1/2020 5:37 PM, TimR wrote:
On Saturday, August 1, 2020 at 7:24:57 PM UTC-4, %% wrote:

Probably fumes from the trap and drain system.

Unlikely to be fumes if the stain is where liquid would run.

Put some water down it and flush it out and it may help.


WTF do you think is happening in that drain?

Most likely something like emptying the bath
is producing a surge up the drain which sees
some dirty water from the drain coming out
the overflow and its that the stains the sink.

You wash down all sort of caustic and organic materials

Its less clear that that is happening
much with that infrequently used sink.


Key word -- infrequently
Dirty water sits and rots.

But doesnt move out the overflow down to the drain.

The stain is exactly where liquids would flow and shaped like they would
be.

But it's hard to see a backup happening out the overflow that didn't also
show at the drain.

I thought of fumes, but they would have to be heavier than air.

I scrubbed it off this morning, too late for a photo. If it recurs I'll
do that. This is the sink I use to brush my teeth, I don't think wife or
daughters ever use it, certainly not on a regular basis. So it gets
about one drinking glass of water per day, but that's every day.

On the other hand. About ten years ago I replaced the faucets in that
sink. I don't remember why but I wouldn't have done that job without a
darned good reason. I do remember the old ones didn't want to come out,
I think I beat on them with a rubber hammer for a long time before they
moved. I had to pull the sink from the vanity into the backyard to get
it apart.

So it's not impossible I screwed something up when I replaced it. But it
hasn't backed up or dripped underneath, so I can't have done too badly.


If you have the bowl filled with water and suddenly open the drain,

He said that it has never had a plug in it

the pressure of the water at the drain will surge water into the overflow
drain tube, perhaps enough to splash some out through the drain hole or
above it where it can then run down and out.

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Rod Speed is an entirely modern phenomenon. Essentially, Rod Speed
is an insecure and worthless individual who has discovered he can
enhance his own self-esteem in his own eyes by playing "the big, hard
man" on the InterNet."

https://www.pcreview.co.uk/threads/r...d-faq.2973853/

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I now have new information.

I did not know my daughter hand washes some types of clothing in a big tub and dumps it into that sink.

I'm guessing that may be the source.