Reliable oxygen supply for ponds and aquariums: The SunSun CAP-20 oxygen pump ensures efficient aeration and improves water quality in small ponds and aquariums. With stable performance and constant flow, it supports the oxygen content in the water and creates a healthy environment for fish and aquatic plants. The pump is ideal for mini ponds, balcony ponds, indoor ponds, and aquariums with a volume of up to 8 m³. Efficient pond aeration with quiet operation: This powerful oxygen pump is specifically designed for efficient pond aeration. It can evenly distribute oxygen and ensures constant water circulation. Its quiet operation makes it ideal for both indoor and outdoor use, allowing pond owners to enjoy reliable aeration without disturbing noises. Versatile application with 4 air outlets: The aerator pump for ponds and aquariums features an air inlet and four separate air outlets. This allows oxygen to be targeted at multiple points in the water to ensure uniform mixing. The included accessories comprise two air stones and two check valves, which prevent backflow of water. Optimal oxygen supply for fish and plants: Through effective oxygen enrichment, the aeration pump supports the ecological balance in the pond or aquarium. It enhances the efficiency of oxygen in the incoming air and helps reduce pollutants in the water. This promotes the growth of healthy aquatic plants and provides fish with an optimal living environment.