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azsoccerpop · 07/04/2018, 03:42 PM

I have a 150 gallon that is already drilled and fitted with 2x 3/4" bulkheads for the returns. I am going to use them. Right now I have 1 Varios 6 pump and was thinking of adding a second so that I have 1 for each return. Because I have to scale down to a 90 degree 3/4" elbow into the bulkhead, does it make a difference if I run 1-1/4" pipe over 1" pipe as far as I can go. Or will the 3/4" bulkhead reduce the flow to similar GPH regardless of the diameter of the pipe used up to that point? Much of what have I read shows almost a double of the capable GPH for 1-1/4" over 1"

07/04/2018, 03:42 PM	#1
azsoccerpop Registered Member Join Date: Oct 2016 Location: Gilbert, Az Posts: 232	Return pipe size question. I have a 150 gallon that is already drilled and fitted with 2x 3/4" bulkheads for the returns. I am going to use them. Right now I have 1 Varios 6 pump and was thinking of adding a second so that I have 1 for each return. Because I have to scale down to a 90 degree 3/4" elbow into the bulkhead, does it make a difference if I run 1-1/4" pipe over 1" pipe as far as I can go. Or will the 3/4" bulkhead reduce the flow to similar GPH regardless of the diameter of the pipe used up to that point? Much of what have I read shows almost a double of the capable GPH for 1-1/4" over 1"