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Most people have been to a pool area at least a few times in our lifetime.
Most people have been to a swimming pool at least a few times in our lifetime. I am sure you have seen the drains around the perimeter of the swimming pools.
Water in a swimming pool is required to 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 found at the bottom of the pool (the lowest point).
At http://www.datafilehost.com/d/2c3b52bd of the pool are pool drains that continously drain wa