Clear-N-Clear - Undergravel Filter 30 Gallons Designed with narrow slat openings

Designed with narrow slat openings

• Make sure that you close the tube tightly to avoid contaminations and for best results

as well as Big Dog’s special extra ingredients

allowing easy filtration and providing essential water quality improvement

The canvas fabric is waterproof

Clear-N-Clear - Undergravel Filter 30 Gallons Designed with narrow slat openingsThe Penn Plax Penn Plax Undergravel Filter combines the function of a traditional filter while offering maximum viewing since its hidden out of sight. Designed for 40 to 50 gallon fish tanks, this undergravel filter uses mechanical, chemical, and biological filtration to filter harmful pollutants from your aquarium. Undergravel filters create the most natural bacteria bed for fish tanks and provide effective aerobic filtration. Included are 4 filter