Ten people enlisted in the competition on Wednesday, with three dropping out on Saturday.
The remaining five men and two women, aged between 17 and 25, from Hoevelhof, showered for over 101 hours to break the 100 hour record set in 2000 by a group of Berliners.
The group was allowed to take just a 10-minute break every hour for food, drink and toilet trips and to rub in more cream to protect their skin from the water. Some of the participants even slept for 10 hours standing up under the shower.
A doctor was also on hand to make sure the lack of sleep does not affect their health.
According to spokesperson Patrick Foerster from the Victoria Hotel in Hoevelhof, where the attempt has being carried out, the atmosphere was excellent.
"The participants are physically in good health, but very tired. We'll now register their successful attempt with the Guinness Book or Records." Marion Sander, spokeswoman for the Hotel Victoria said after the event.
The longest shower records men won 2,000 Euros.