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.
 

WHAT’S THE HARDEST PART OF REEFING TO EXPLAIN TO A NON-REEFER?

  • Why a tiny coral frag can cost that much

    Votes: 15 27.8%
  • Why I spend time testing and adjusting water

    Votes: 8 14.8%
  • Why the fish I want might not fit my tank

    Votes: 9 16.7%
  • Why I have buckets, tubing, and salt around the house

    Votes: 1 1.9%
  • Why corals are living animals, not decorations

    Votes: 15 27.8%
  • How much time and attention a reef takes

    Votes: 16 29.6%
  • The difference between freshwater and saltwater creatures

    Votes: 2 3.7%
  • I’ve stopped trying to explain

    Votes: 14 25.9%
  • Other (Post in the comments)

    Votes: 6 11.1%
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