*Product May Be Subject To Extended Lead Times. The UltraZap Combibox 1 is a comprehensive filtration solution designed for koi ponds up to 12,000 litres. This turnkey system includes a 15W UV clarifier to eliminate free-floating algae, a 2-bag sand filter (excluding sand) for mechanical filtration, a 25L biofilter filled with bioballs for biological filtration, and a 0.6kW pump to ensure efficient water circulation. This combination ensures clear, healthy water with minimal maintenance.