Tetra Whisper Air Pump - Deep WaterTetra Whisper Aquarium Air Pumps (formerly Tetratec Deep Water Air Pumps) are Tetras most powerful line of air pumps. The Whisper is excellent for delivering air to protein skimmers, tall tanks, even ponds, and makes an ideal deep water air pump! Powerful air pump for aquariums Ideal for deep water applications pumps air down to 8' deep Helps aerate water for a healthy aquatic environment The pumps are designed for situations that produce more back