This Birm unit is supplied partailly assembled for shipping. Some assembly will be required. All components and instructions will be supplied.
The Birm unit size is the physical size of the vessel given in inches (eg 10" x 44").
The figure in cubic feet (cu.ft) is the volume of the Birm.
The lph (litres per hour) figure is the maximum flow rate.
This system relies on there being enough dissolved oxygen in the water to work. This kit has the option of adding an air draw kit - this puts an air pocket above the media so as the water cascades through it oxygen is adsorbed into the water.