Paramount manufactures the Active Drains, which are unique in safety and performances: MDX, MDX2, MDXR3.
It is about the active drains, which do have an active role in cleaning the debris from the swimming pools, spa or fountains.

The Active Drains meet all the regulations and safety rules in the US. These drains are very effective as they remove actively the debris swept by the cleaning systems inside the swimming pools, Spa or Fountains. They are manufactured and supplied in eight different colors in order to better match the finished pool color. These drains are specially made to be installed in Concrete Pools, Liner Pools and Prefabricated/One Piece Pools.

They are installed as part of the Automatic In-Floor Cleaning Systems and also the Smart Filtering System which provides big savings in water, energy and chemicals.

More details on the "MDX" page.