Is grey PVC considered reef safe?

[xtreme]

I've used it before. I think you should be fine.

[Coleus]

i used it too and it is fine. Just make sure you let it dry for 24 hours or so to be safe

[mike31154]

Keep in mind that the thicker walled material, such as Sched 80, will restrict flow more than equivalent sized Sched 40. Outer diameter is the same, but inner is less to allow for thicker wall = more restriction/less flow. Solution is, of course, to upsize when going to thicker walled material.