Quote Originally Posted by desertstalker View Post
It does not matter (from a pressure perspective) how wide the pipes are. Pressure only depends on height (it is a measure of Force pre Unit AREA) and as the RAD will be relatively restrictive, compared to 1/2" pipe, you will not see a noticeable difference in flow due to larger tubing.

Just use the same size pipe for the whole thing, should be a lot easier.
by reducing the diameter in increments (the largest diameter would be the longest piece ) I get a larger volume of water in the overall vertical drop , more volume, more wieght, move gravititational pull = more pressure at the smallest diameter which would be at the the rad inlet where i need it most