ALoha All
. This is how you check what pump size is needed.
On the package of the sprinkler head y ou've purchaced, it should list the release amount of water GPH. You use that number and multiply by the amount of spray sites you have. Then you multiply X2. That will give you the GPH pump that you need..
For example~ sprayhead release 20gph X 20 spray sites= 400 x 2= 800.. 800gph pump is what you need..
~ reference to what i said~
http://thegrowroom.com/pumps.html