Has anyone else ever noticed this phenomenon, that mostly appears in
commercial structures? If you look at the water level in the toilet
bowl, it is constantly rising/falling about 1 cm. What causes this
exactly? Is it something to worry about?

"Elliott Plack" wrote in message
oups.com...
Has anyone else ever noticed this phenomenon, that mostly appears in
commercial structures? If you look at the water level in the toilet
bowl, it is constantly rising/falling about 1 cm. What causes this
exactly? Is it something to worry about?


Only if you have your head in the bowl.

Elliott Plack wrote:

Has anyone else ever noticed this phenomenon, that mostly appears in
commercial structures? If you look at the water level in the toilet
bowl, it is constantly rising/falling about 1 cm. What causes this
exactly? Is it something to worry about?


It can be caused by wind pressure changes on the vent stack terminal.

Another common effect is from flushing large volumes of water
where gang toilet/urinal installations are present with flushometer
valves. The plumbing design takes this into account and vent
connections should be able to correct it leaving only small disturbances
in trap water levels.

In either case, Codes allow for trap disturbance of 1" water level or so.

No, it's not a problem .

Jim

Thanks Jim. That's all I wanted to know.

On 7 Feb 2006 14:51:53 -0800, Elliott Plack wrote:

Has anyone else ever noticed this phenomenon, that mostly appears in
commercial structures? If you look at the water level in the toilet
bowl, it is constantly rising/falling about 1 cm. What causes this
exactly? Is it something to worry about?

Nothing to worry about unless you have large genitals and the water level
is 1 cm beneath them while you are on the bowl.

--
Customer Service Sign: Helen Waite is now in charge of all rush orders. If
you are in a hurry, just go to Helen Waite.


2/8/2006 12:09:25 AM

Also can be caused by inside air pressure changes. Opening and/or
closing the bathroom door or an outside door may cause the water level
to change.

On Wed, 08 Feb 2006 00:05:47 GMT, Speedy Jim wrote:

Elliott Plack wrote:

Has anyone else ever noticed this phenomenon, that mostly appears in
commercial structures? If you look at the water level in the toilet
bowl, it is constantly rising/falling about 1 cm. What causes this
exactly? Is it something to worry about?


It can be caused by wind pressure changes on the vent stack terminal.

Another common effect is from flushing large volumes of water
where gang toilet/urinal installations are present with flushometer
valves. The plumbing design takes this into account and vent
connections should be able to correct it leaving only small disturbances
in trap water levels.

In either case, Codes allow for trap disturbance of 1" water level or so.

No, it's not a problem .

Jim