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A part of the circulation system that removes debris from the surface of
the water by drawing surface water through it.
Main Drain
The suction fitting located in the lowest portion of an in-ground pool.
It's the principal intake for an in-ground pool's circulation system. The 2007 Virginia Graeme Baker Pool and Spa Safety Act requires anti-entrapment drain covers and other safety devices.
PPM
This is the abbreviation for Parts Per Million. The unit of measurement used in
chemical testing which indicates the parts by weight in relation to one
million parts by weight of water.
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