Fully submerge a media reactor?

Why would it increase back pressure? Some arcane branch of physics I'm unaware of LOL. I have done this for years in my sump, it's fine.
 
I do it too in one situation where I have no room to hang it out of the water. It is fine. Other than getting a bit of organics on it from being submerged, it does the job just fine.
 
Why would it increase back pressure? Some arcane branch of physics I'm unaware of LOL. I have done this for years in my sump, it's fine.

I figured since the outflow would be restricted by virtue of the effluent being underwater it would add some back pressure to the pump. Albeit: 1. I'm only submerging it, slightly below the waters surface. 2. I know little to nothing about fluid dynamics.
 
Think of it like a closed loop. No head pressure because both inlet and outlet are in the same body of water.
 

WHAT DO YOU ALWAYS RUN OUT OF AT THE WORST TIME?

  • Salt mix

    Votes: 12 16.2%
  • Fish or coral food

    Votes: 4 5.4%
  • Test kits or reagents

    Votes: 7 9.5%
  • Filter media or replacement fleece

    Votes: 4 5.4%
  • RO/DI filters or supplies

    Votes: 13 17.6%
  • Fragging and repair supplies, like glue or epoxy

    Votes: 8 10.8%
  • I keep a backup of everything

    Votes: 20 27.0%
  • Other (Post in the comments)

    Votes: 6 8.1%
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