On my old (30+ year) in ground concrete pool the skimmer line size is 2" from the skimmer through the pool shed through a 2" gate valve and 2" all the way to the pump. All other lines, pool return, drain, spa drain, spa return and even the pump to the filter are all 1 1/2". I want to update all the plumbing in the shed and get ride of all the gate valves. (Kinda looks like the WW I submarine now.)
It would be easier to re-plumb it all in 1 1/2". But, is there a reason for the skimmer line being larger? The only possible reason I could think of was to help make it more clog free.


Cheers, and thanks in advance.