• FOR 1-4 GALLON AQUARIUMS: Tetra® Whisper® 4i Internal Power Filter uses Small Whisper BioBag filter cartridges that are easy to change.
•  27 GPH MOTOR: The internal 27 GPH pump cycles a 4 gallon aquarium more than 6 times per hour. 
• POWERFUL FILTRATION: Water flows through the cartridge floss, trapping debris and fish waste, while Ultra-activated® carbon helps remove odor and discoloration. 
• SPACE-SAVING DESIGN: Your aquarium can be 1” from the wall with the internal filter designed to clip on your tank wall and be hidden by décor. 
• ADJUSTABLE: Adjustable clip and suction cup allows for a variety of setups to easily adjust to high or low water levels.

Tetra® aquarium products are dedicated to helping seasoned hobbyists and beginners alike enjoy a successful, life-long aquatic experience. Tetra products build fish-, reptile- and pond-keeping confidence, one innovation at a time. Our complete line of Tetra® nutrition, water care, filtration and aquarium products help make fishkeeping accessible to all hobbyists so they can benefit from its rewards. The Tetra® Whisper® 4i Internal Power Filter for 1-4 gallon aquariums uses small cartridges to provide three-stage mechanical, chemical and biological filtration. Water flows through the cartridge floss, trapping debris and fish waste, while Ultra-activated® carbon removes odor and discoloration. The 27 GPH motor cycles a 4-gallon aquarium more than 6 times per hour. Easily change cartridges with the hinged lid for easy access. The space-saving design is easily hidden by décor and allows aquariums to be positioned as close as 1 inch from the wall. The adjustable, universal clip and suction cup allows for a variety of setups to easily adjust to high or low water levels. And, the cord organizer keeps everything neat and tidy. 

Use Instructions

• Lift the filter cover. Rinse the cartridge with tap water and place in filter. 
• Install the filter inside the back of your aquarium using the clip provided. 
• Adjust the clip on the back of the filter to position between max and min water levels. 
• If the hanger doesn't fit, or if you cant position the filter to your desired water level, you may need to order suction cups (see spare parts list on back panel to order). 
• Once the filter water level is within the recommended parameters, plug in the filter, adding a drip loop for safety. Avoid using sand in the aquarium as this clogs the filter.