Waterworks (4): the sand filter building – filter aeration
The sound was recorded in the course of aerating the sand filter. Water from the settling tank where most suspended matter was…

Ilosaarirock Festival is an annual rock festival held in Joensuu, Finland. The festival was founded in 1971 and it is the second oldest rock festival in Finland that is still active. It is also one of the oldest rock festivals in Europe.
In 2018 the festival had 65 500 festival goers. The festival lasted for three days and was held 13th - 15th of July. The city of Joensuu has 76 000 inhabitants. These recordings were made to study the change in the city soundscape during a mass event.
The festival and the VR railway company have organised an extra train from Joensuu to Helsinki that departures in the night after the festival. This recording was made at the train station before the festival train leaves.
Sound & photo: Antti Makkonen
The sound was recorded in the course of aerating the sand filter. Water from the settling tank where most suspended matter was…
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