Herbie plumbing

[Reaper7535]

From what I've read, most people recommend not using 90's on the drains because of lower flow. 45's seem to be the way they go. I saw on the BRS that they ran a test and showed hardly any flow difference between the two. Of course, this was on pressurized and not a drain system.

Would I really be hampering the Herbie by using a couple 90's on each drain or am I looking at creating air pockets. I can probably figure out how to get 45's in there if need be, just want to keep options open. I definitely want to stay with rigid pvc and not spa-flex.

Both the siphon and emergency will be 1" as well as my return which will be plumbed up over the back. This will be a pretty straight run with the exception of a small manifold that will be fed.

 

[Fish Tank Travis]

I have 90’s on my setup and have no problems. You can run your piping uphill so that air will not get trapped. However, it is likely that there will be air in it after the siphon is broken and you will just have to wait a few hours to get it flushed out. That is how my herbie setup goes after a water change. A few hours of hearing a faint running water noise, and then it’s back to completely silent.

 

[DN328]

As you've noted from the BRS video, I don't think even the full siphon on the Herbie will make a signifcant difference.

Are you planning to T off the return PVC line into two 1" returns?

When my internal overflow box fills after a WC, it's good with no issues and slient.