Effective high flow multimedia internals are required to evenly distribute and collect water over the entire surface of the filter bed, during both normal service and backwash, and to distribute scour air during backwash.
The top system consists of an inlet header pipe with regularly spaced laterals ending with upward facing distribution heads. This arrangement ensures even flow through the filter bed, which is essential for maintaining high particle removal efficiency as well as ensuring that air does not collect in the top of the vessel during backwash.
The backwash sequence is critical to the continuous satisfactory performance of the filters. Based on numerous years development and operating experience, the sequence utilised by the Serck Separation Technologies filter has proven to be the most effective in returning the filter to its “clean bed” condition.
The Serck Separation Technologies filter includes an accurate backwash flow control system to ensure that the filter bed is fluidised to the optimum amount to remove all trapped suspended solids, whilst ensuring that excessive wash flows do not occur.
The appropriate media grade selection is critical for the required filtration duty, including the ideal backwash cycle to recover a fully clean and re-stratified filter bed ready for the next duty cycle.