Head pressure -- how much flow am I really getting

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125mph

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I'm running a 57W UV so I'm trying to dial in the flow. The UV is plumbed directly into the return.

I have so many elbows and T's and an unused manifold, I think its too inaccurate to calcuate the head pressure. Here's a video of my return flow.. Do you think this is around 300gph, 500 or 800? Guestimate?

The return is split into two nozzles.

 
IMG_9324.jpeg



IMG_9325.jpeg



IMG_9329.jpeg
 
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