Hard Plumb Question & Size

[mas985]

The primary advantage of larger pipe is less head loss and higher flow rates so turnovers will be faster and you can shorten the pump's run time saving $$.

In addition, because of the lower head loss, the pressure inside the pipes will be less with 2" than 1 1/2". In most cases, higher pressure is not a huge problem unless there is a weak joint somewhere.

Also, 2" is not that much more expensive than 1 1/2" so I would go with the 2".

Any reason other than cost that you did not want to go with 2" pipe?