Help keep your aquarium in tip-top condition with Tetra’s Whisper EX Power Filter. This filter is designed with simplicity and convenience in mind and is ready to use right out of the box with no priming required! The scientifically engineered water flow provides a continuous flushing action to prevent debris buildup while the optimum outflow maximizes water agitation and oxygenation. Best of all， it features a time-strip technology that lets you know when it’s time to replace the filter!