*Product May Be Subject To Extended Lead Times. Designed for ponds between 12,000 and 30,000 litres, the UltraZap Combibox 4 offers enhanced filtration with a 55W UV clarifier and a 3-bag sand filter (excluding sand). The 0.6kW pump ensures consistent water flow. This combo excludes a biological filter, providing flexibility to add a biofilter of your choice based on specific pond needs.