How much flow am I losing?

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HighChiefKC

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I don’t know why I done this, maybe because I didn’t want a 1.5” elbow showing in back of tank. But I have a Pentair UV that is 1.5” plumbing. I have it going from 1.5” down to 1”, then it goes thru 2 90 degree elbows before it gets to my neptune flow meter. How much flow am I losing going from 1.5” to 1” then thru 2 90s? Say I’m getting 700 gph currently at the flow meter. What would it be close to before the reduction?

just curious. May end up redoing plumbing. Seems like I’m losing a lot of flow. I have a vectra L2 turned up to 85% and I’m getting 800gph at the end of plumbing. There’s a few more elbows before the UV. But I’d have to find another union that fit the UV since it’s glued
 
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xxkenny90xx

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Your definitely losing flow that way. Is the uv inline with your drain or return plumbing? Ill take 2 45 degree elbows over one 90 any day. Or better yet I like to incorporate a bit of spa flex tubing here and there when I can
 

1guydude

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I dont think ur losing flow. The 1" can do 800gph. The flow wont decrease in 90s. Its pressured and than released.
This is my opinion and im not a plumber. Lol!
D
 

Imaexpat2

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I wouldnt worry about a little reduced flow as much as I would be worrying about does the water passing through the UV have enough dwell time to kill what ever is in the water before going back into my tank.
 
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ca1ore

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Just to clarify, it’s an L2 pump that you’re getting a reading of 700 gph? Pump running at what %? Either way, Vectra performs quite poorly against back pressure. I’d guess that going from 1 1/2” to 1” is costing you quite a lot. If I had to guess I’d say around 500. Elbows aren’t helping.
 
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