For ponds 7 foot deep or less these linear powered aeration systems are a great choice: This double diffuser system, is idea for long and narrow or irregular shaped ponds. Kit includes Quick Sink tubing for easy installation. Part # - PA8SW Double diffuser system with KLC80 Compressor 100 Ft. of 1/2" Quick Sink Tubing Included Extremely energy efficient Very quiet operation Long lasting, oil free design Weather resistant enclosures - can be used outdoors. For maximum longevity use additional protection from elements. Three year warranty on compressors, Five years on tubing and diffusers