Food grade tubing vs non: which do you use?

[Futuretotm]

So do you guys use food grade tubing in your sump? Ie for return lines, UV sterilizer, reactors etc

Is it okay to run non-food grade tubing?

 

[LRT]

For chemical leaching reasons.
I wouldnt use anything without a 5 or 7 rating. You can buy black tubing that is used in hydro grow applications in pretty much any size you need.