*Product May Be Subject To Extended Lead Times. The UltraZap Bio Filter 15 Litre Including 200 Bio Balls is a powerful and efficient biological filtration system, purpose-built for larger ponds and water systems with higher filtration demands. This unit features a spacious 15-litre chamber filled with 200 high-quality bio balls, offering an extensive surface area for the growth of beneficial bacteria. These bacteria are essential to the nitrogen cycle, breaking down harmful ammonia into nitrites and then converting nitrites into less toxic nitrates. With the added benefit of bio balls, this filter enhances biological efficiency and promotes stable, healthy water conditions. It’s ideal for koi ponds, ornamental water features, and aquaculture systems, delivering reliable, low-maintenance performance. The UltraZap Bio Filter 15 Litre with Bio Balls is a trusted solution for long-term water clarity and the overall health of your aquatic ecosystem. Pond cap is 7000L.