Pond Air Pump from Blagdon. Fish and pond life require oxygen-rich water to remain strong and healthy. The beneficial bacteria in your filtration systems also need oxygen to flourish and keep your pond free from the build-up of toxic waste. Aeration is especially important through the warmer months where water holds less oxygen. Oxygenating plants produce oxygen during the day, however, they start to use oxygen at night, which depletes your pond of oxygen. The Blagdon Pond Oxygenator dramatically increases oxygen in the summer months and helps prevent pond freezing during the winter. Aids in circulating your pond. This medium kit comes complete with air stone and airline and has a 3-year warranty.