Inlet vs outlet size

IRL

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Hi
On the DIY 55 gallon drum filter I have read that the outlet should be twice the size of the inlet. If I have a 3/4 inlet, should I have a 1 1/2 outlet, or should I still have a 2" outlet like most people i have seen? Or, should I just switch to a 1" inlet?
Thanks
 

addy1

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Either would work, the bigger the piping the less friction you have even on the inlet.
 

fishin4cars

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either way would work fine, but like Addy said, if you go bigger there is less friction and better flow rates once there starts to get build-up inside the pipes. On the bottom drain, be sure and go 2" you do want to get as good a flush as possible at the bottom of the 55 gallon barrel.
 

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