*Product May Be Subject To Extended Lead Times. The UltraZap Bio Filter 10 Litre Including Bio Balls is a high-capacity, efficient solution for maintaining clear, healthy pond water through natural biological filtration. Designed for medium to large pond setups, this filter features a spacious chamber filled with specially-developed bio balls. These bio balls provide an optimal surface area for beneficial bacteria to colonize, playing a vital role in the nitrogen cycle. As water flows through the filter, these bacteria convert toxic ammonia into nitrites and then into much safer nitrates, reducing harmful buildup and supporting aquatic life. The included bio balls enhance the system’s performance by increasing filtration efficiency while remaining easy to clean and maintain. With its durable build and high filtration capacity, the UltraZap Bio Filter 10 Litre is an excellent choice for long-term water quality management in any pond environment. Includes 130 Bio Balls. Pond cap is 5000L.