Bioforce is a pressurised system that means a smaller, less obtrusive container size is needed and it can be buried next to the pond out of sight. Pressure also means that filtered water can travel up to the top of a waterfall without the need to be placed at the same high level. Includes foam media and biological filtration from Kaldness K3 bio media. Kaldness is scientifically proven and in widespread use in industrial water purification processes. As a result, it has vastly superior biological capacity compared to other biomedia used in pond .Unit has built in ultra-violet light.