Premium Undergravel Aquarium Filter pond algae ensuring it's positioned above the

ensuring it's positioned above the water to prevent reverse water flow

alpha™ removes chlorine

mimicking the natural ocean currents and promoting full circulation

depending on the original pH

Premium Undergravel Aquarium Filter pond algae ensuring it's positioned above thePenn Plax Clear Free Premium Undergravel Aquarium Filter Premium Undergravel Aquarium Filter is used to provide an efficient, low maintenance filtration solution for both freshwater and saltwater aquariums by promoting biological filtration beneath the gravel. The Penn Plax Clear Free Premium Undergravel Aquarium Filter provides an efficient, low maintenance solution for keeping your aquarium clean and your fish healthy. Designed to be placed beneath