Replacement filter media
Over time filter media can get so badly sludged up then it's worth considering starting afresh. If a filter has been removed from a pond system for some time then the bacteria will die - again replacement media should be considered. Can also be used if constructing your own DIY filter.
We now had all of the waterfall building materials together on site. The task was to stabilize the waterfall with a concrete foundation then to design its appearance.