Fluidised Bed Type M140 - Gravity ReturnFluidised Bed Type M140 - Gravity Return  Ref: CLFBM140
Gravity Installation: For guidance purposes this configuration is based upon a gravity supply to the main filter, with the external filter pump feeding and discharging through the FB unit. Return to pond is via a single pipe. In setting up the ball valve (No2) correctly the main content of water returning to the pond from the main filter is designed to flow through the manifold pipework on the FB tower, without actually passing through the FB media itself. Only a small percentage (around 10%) of water passes direct through the FB media.