For the most part I'm lazy I mean all that caculating makes my brain hurt.
So as to increase my lazyness I found this;

http://www.sprinklerwarehouse.com/EZ...b-Drip-System-
p/2005-hb.htm

Has any one tried one of these??
I use a hose attached sprinking system in my greenhouse so it will be a no
brainer to install.