PFlow Particles not showing in Rendered image

[dande]

I'm using PFlow to create rain. The particles show up in my viewport. When play the animation the particles fall from the sky just as I want.

 

But when I render a view with the particles they don't show in my render. I have applied a yellow material to the particles and made them huge just to see if they will show up. But no luck.

[dande]

Ignore this post. I just realised I forgot to put a render operator in.