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Message: [QUOTE="addy1, post: 239883, member: 2547"] Having never used one, this is my understanding.................. The heater is around the tubing going out of the water, there is a small pump that is submersible. The heater keeps the tubing from freezing up. The small pump moves a small current of water through the tube that is going up and out of the pond to be aerated, then that water comes back into the pond. This creates a gentle current of water, with an exchange of gases. [ATTACH=full]74957[/ATTACH] [/QUOTE]