dart pump question

[Aquattro]

Originally Posted by christyf5

You know, I have no idea where I got it originally but I have seen it perpetuated throughout various forums. Is this not the case??

got it from me. 1 90 elbow puts an extra foot's worth of head into a circuit. Or close enough to calculate for our needs.

Of course now that I try to find where I got that from, I can't, and find other sites that tell me 4ft for a 90 at 1" ID...sigh