SBR (styrene-butadiene rubber): reef safe?

For what?

If you mean for use in a reef tank, it should be fine, health wise, if you wash it carefully first with warm soapy water to remove compounds like mold release agents.

That assumes it is not intentionally impregnated with materials to prevent mildew or metals to make it conducting (hence my reason for asking the purpose). It will almost certainly tell you if those are the case, since they cost money to add.
 
How is that to be used?

I have a polypropylene box, open on one side. There will be a sponge wedged into the opening. Opposite the open side, I've drilled a hole. A grommet will secure the output of a submersible pump in the hole. Water will be pumped into the box, and flow out through the sponge.
 

WHEN REEFING GETS TOUGH, WHAT KEEPS YOU MOST INVESTED?

  • My livestock depends on me, so I keep showing up for them

    Votes: 15 51.7%
  • I look for small signs that things are improving

    Votes: 3 10.3%
  • I want to figure out what’s going wrong

    Votes: 1 3.4%
  • I remind myself that rough stretches will pass...just keep reefing

    Votes: 6 20.7%
  • I lean on other reefers for advice or encouragement

    Votes: 0 0.0%
  • I simplify, step back from tinkering, and give the tank time

    Votes: 2 6.9%
  • Honestly, sometimes I wonder if I want to keep going

    Votes: 2 6.9%
  • Other (Post in the comments)

    Votes: 0 0.0%
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