In an earlier contribution to this discussion,
Flummoxed wrote:

Hi folks, a quick question. Today I just saw a lavatory cistern that
had a strange flushing mechanism (well it was strange to me anyway, I
hadn't seen one before). There was push button to flush the toilet,
and I had a peep at it as far as I could, and saw it had a sort of
plastic tube that connected to the flushing mechanism somehow. It
seems as if pushing the button would just push some air down the tube
and start the flush. Any idea how this works?

I wasn't able to see inside the cistern, but I wonder if this type of
flushing mechanism is reliable, i.e. do they experience any particular
problems compared to the "traditional" syphon flush?

I'm interested because I hope soon to do up our bathroom so I will be
looking to replace everything, including the lavatory cistern etc. and
I'd be interested in this type of flush if they're any good.

Any experience or advice on this type of flush, vs. the "traditional"
type, would be welcome.

TIA

Flummoxed

A lot of the bathroom suites sold by the sheds have got this type of flush
these days. If it's like mine, there is a large vertical tube up the centre
of the cistern, the bottom of which is connected to the outlet. When the
cistern is full, this tube is surrounded by water. pressing the button opens
a valve at the bottom of the tube, allowing the water to enter the tube and
flow into the pan. As I see it, this type has advantages and disadvantages
compared with conventional syphons.

Advantages
* Cheap
* Doesn't need a separate overflow (if the water overflows it enters the top
of the tube and runs into the pan)

Disadvantages
* The flush valve may leak and waste water
* No external evidence of overflowing - again wasting water

I'm sure there are others . . .
--
Cheers,
Set Square
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