Device and Method for Filtering and/or Purifying Liquid

A method for purifying and/or filtering liquid, the method comprising the steps of:

• providing a device according to any one of the foregoing claims;
• arranging carrier material in the purification chamber, wherein the carrier material is preferably provided with a biofilm;
• supplying a fluid for purifying;
• and
• realizing in the purification chamber a substantially vortex-like fluid flow path for the fluid which extends between the at least one outer opening and the fluid throughfeed openings.

A carrier material composition configured for use in a device for filtering and/or purifying liquid, the device comprising:

• an outer housing provided with at least one outer opening;
• an inner housing which encloses an inner chamber, wherein the inner housing is provided with an inner opening;
• and
• a purification chamber which extends between the outer housing and the inner housing, wherein the at least one outer opening debouches in the purification chamber and wherein the purification chamber is provided with a carrier material on which a biological purification film can form for filtering and/or purifying water,
• wherein a side wall of the inner housing which is adjacent to the purification chamber is provided with one or more fluid throughfeed openings,
• wherein, during use of the device, a substantially vortex-like fluid flow path is formed in the purification chamber, between the at least one outer opening and the fluid throughfeed openings, and
• wherein the composition comprises a mixture of floating carrier material and non-floating carrier material, wherein the ratio of floating carrier material and non-floating carrier material lies in the range of 70%-30% and more preferably about 50%-50%.