Is grey PVC considered reef safe?

[ner'T']

Is grey PVC considered reef safe?

I know its still PVC and compatible with the white. Its for electrical conduit and white is approved for potable water sittuations. Its nice because its schedule 40, (thinker then the white).

I want to use it for my return lines. I think it looks a little better then plain white with primer/glue stains!

Thanks for any input!