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All of us have been to a pool area at least a few times in our lifetime.
All of us have been to a swimming pool at least a few times in our lifetime. I am sure you have seen http://jasrafamily.de/wiki/index.php?title=A-strainer-commonly-known-as-floor-drain-cover-or-floor-gratinggrate-should-always-be-used-all-the-time-to-protect-the-floor-drain-s around the perimeter of the swimming pools.
Water in a swimming pool needs to be constantly circulated through a filtering system to remove debris and dirt. In a swimming pool filtration system, water flows to the filters through various drain