The owners of thermal spas in Budapest, Hungary, have an interesting way of boosting income from winter to spring - they hold pool-based rave parties.

Known as Sparties, the events are held on select Saturdays and are co-ordinated by Cinetrip - a company that specialises in audio-visual parties.

The baths are transformed using 3D, 360° projections, laser shows, fire, water and air-based acrobatics and belly dancing performances.

There are also live DJs; previous international guests include the Chemical Brothers.

The dress code is swimwear or beach clothes and various rules - such as no alcohol, glass bottles or pool jumping - are in place to ensure the party is safe as well as fun. Hosts for 2011 include the Széchenyi Spa and Rudas Bath.

On the door tickets cost HUF10,000 (£30). Details: www.cinetrip.hu