Question about direct feeding external skimmer

marino420td

Premium Member
I am about to start the plumbing on my 120 tank. The overflow has a 1 1/2" bulkhead so I will be using this size pvc for the drain. I have this H&S skimmer (A150-F2001)

HSSkimmer.jpg


It has a 5/8" intake.

My question is at what point do I decrease my drain from 1 1/2" to 5/8" to feed the skimmer? I plan on plumbing similar to the ones in this thread.

http://www.reefcentral.com/forums/showthread.php?s=&threadid=818695&perpage=10&pagenumber=1

Thanks for the help.
 
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