*Product May Be Subject To Extended Lead Times. The UltraZap Bio Filter 15 Litre is a high-performance biological filtration system designed to support larger ponds with greater water volumes and fish loads. This advanced filter provides ample space for beneficial nitrifying bacteria to grow, enabling the natural breakdown of harmful ammonia and nitrites into less toxic nitrates. This essential biological process helps maintain optimal water quality and supports a healthy environment for fish, plants, and other aquatic life. Ideal for demanding pond setups, the 15-litre capacity ensures consistent and reliable filtration performance. Its durable design and easy integration with existing pond systems make it a low-maintenance yet highly effective solution for long-term water clarity and balance. Whether you’re managing a koi pond, ornamental water feature, or aquaculture system, the UltraZap Bio Filter 15 Litre delivers robust, dependable results. Pond cap is 7000L.