[WarDog]

Originally Posted by smokinreefer

Great info people!

So should I be looking at 3 Lines?
1 1.5" for herbie drain.
1 1.5" for emergency drain.
1 1" for return line?

That will be just fine. You could also do a 3/4 for the return.

Originally Posted by davej

BRS just did a video on 90s compared to 45s and the difference was minuscule.

https://youtu.be/h-PG4a0rU60

I always have a good chuckle when hobbyists debate flow through different fittings. It's a plumber thing.