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A counter-current system is a mechanism where two fluids flow in opposite directions, typically in close proximity, to enhance exchange or transfer of a substance or property between them. This system is commonly found in biological and engineering contexts, such as the kidneys for water conservation and heat exchangers for temperature regulation. 

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A swimming pool heating system regulates the temperature of pool water, making it comfortable for swimming regardless of weather conditions. Common types include electric resistance heaters, gas heaters, solar heating systems, and heat pumps. Heat pumps, in particular, are energy-efficient, transferring heat from the surrounding air to the pool water.