Basins :

Important: number of, material, decline, self-cleaning capacity, and evacuation piping, cease/sort possibilities in or outside the basin, need supplies for oxygen, de-gassing possibilities.

Concrete  longstream basins                               Polyester longstream basins                                 Particle afscheider to allow

PE roundstreambasins

Round polyster basin in sandbedding; concrete on/off for                                                Longstreambasin for trout