A calmed inlet is a special footed u-bend that sits at the bottom of the tank inlet pipe on the floor of the tank. The calmed inlet directs incoming flow up and away from any sediment that has settled at the bottom of the tank. In this way incoming water does not disturb the sediment and contaminate the rest of the tank water.
The Marley calmed inlet is designed to slide onto the bottom of Marley 100mm pipe. Smaller diameter pipe should be positioned so that the pipe is centred as far as possible down into the calmed inlet.