"gardenlen" wrote in message
...
g'day steve,

could there be a limit to how many head can be run or added to system?
if you add heads in then that effects how well what was there before
works, might need to divide or get heads that deliver at lower
pressure??

or somehow increase the pressure in?

Have considered a booster pump, as this is a gravity fed/booster pump
situation from a local mountain stream, and a holding reservoir. Pressure
varies a lot according to use.

Steve