More than 350 delegates are attending the summit

It is the first World Toilet Summit to be held outside the Far East.

Delegates come from such sectors as public health and educational authorities, hospitality and tourism bodies as well as toilet providers.

The Bog Standard campaign to raise the calibre of Northern Ireland's school toilets is also being launched.

It wants to "bring awareness of the health and learning benefits of better toilets for pupils", a statement said.

The campaign will also encourage schools to allow pupils to use the toilets when needed.

More than 350 delegates from the US, Europe, Australia and the Far East will get a chance to see the latest innovations in toilet technology.

TOILET FACTS The average person visits the toilet 2,500 times a year The first toilet stall in a public washroom is the least likely to be used: it is also the cleanest. Most toilets flush in the key of E flat

These will include a brand new pop-up urinal to be unveiled in Belfast's Shaftesbury Square.

It is concealed beneath the pavement during the day, but at night it rises hydraulically for use by late-night revellers.

Delegates will also hear presentations such as Changing Washroom Behaviour, Public Toilet Excellence - The Singapore Model and Managing Out Crime in Public Toilets.

A speaker from Indonesia will describe how a toilet relief programme was introduced following the tsunami disaster.