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Most people have been to a swimming pool at least more than once in our lifetime.
Most people have been to a pool area at least a few times in our lifetime. I am sure you have noticed the drains around the perimeter of the swimming pools.
Water in a swimming pool should be constantly circulated through a filtering system to get rid of debris and dirt. In a swimming pool filtration system, water flows to the filters through various drains located at the bottom of the pool (the lowest point).
At the top of the pool are http://blackbookencounters.com/user_forums/discussion/135/currently-o