"MiamiCuse" wrote:

Would losing water cause only this brand of heads to not pop up fully while
other brands of head (even further downstream ones) pop up and spray freely
and nicely? for example one of them I had three rotors, 3 spray heads of
other brands, 1 shrub head, and 1 misting head all working great, all
downstream of it. The 3 out of 4 Orbit Hardtop spray heads are exhibiting
problems in this particular branch.


Having different heads on the same zone typically does create an
*imbalance* problem such as you describe. Water is going to seek the
path of least resistance so will flow from the least restrictive heads
first. Each head should have a method for adjusting rate of flow,
usually a small screw that acts as an on/off valve. You need to close
the valves on those heads that are flowing and see if water then flows
from those heads that were not flowing. Then go about attempting to
adjust all the heads in hopes of creating a balance. But to be
truthful there should only be one type of head for each zone... it
seems like you tried to save labor and money by cutting down on the
number of zones by mixing types of heads in a single zone... that is
not going to work, and because water pressure changes constantly, and
drops significantly during periods of high usage, it will be
especially difficult to balance different types of heads in one zone.
I doubt you have an underground leak or you'd have found it by now.
There could also be a problem of having too many heads on one zone...
and there can be other problems such as equipment failure, sand in the
system will inhibit pop-ups.