The Hydro-FIL™ is a robust and well-established gravity filtration system commonly used as a secondary treatment to further reduce the TSS and turbidity after the Hydro-PAQ™. Cross-flow method plays an essential role by utilising the feed water to increase backwash efficiency, resulting in shorter backwash durations, smaller pumps, and reduced power consumption. When combined with Hydro-PAQ™ technology, this unit serves as an effective solution for treating large volumes of water.