As a rule of thumb, the more water that is diverted the better the quality of water in the tank.
The Diverters are sold in kit form and incorporate standard 90, 100, 150 or 300mm PVC pipes as the diverter chamber section. The length of pipe used will vary depending on the volume to be diverted. Diverters with a variable volume chamber are better than fixed volume diverters because the volume of diverted water can be customised to the specific requirements of each roof.