UV sterilizer or Skimmer

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The surface skimmer is a black box that goes around the pump to draw water from the surface. You can take a look at them on my site if you like.
 
I should mention that CPR's and Remora's have an optional surface skimmer attachment also, which fits around the pump, and basically helps get the top later of water (where most of the DOC's reside) into the skimmer unit, which helps the skimmer pull even more gunk out because its pulling the 'dirtiest' water into the skimmer.
 
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