Chris Lewis wrote:

According to Ray K :



No, they are at the most distant end.



I'd pull the caps/strainers out of the two "slow" ones and the one
immediately previous to them and make sure they're clean. This
should include being able to see into the housing to see if there's
something plugging the line.

The nozzles on these things sometimes plug up with grit even
tho they have strainers.

While you have them open, check for frost-distortion. Ie: cracks,
splits, or jammed/seized/bent popups (the popups may be stuck, most
units dribble if they can't get the popup all/most of the way up).

If that doesn't help, put bricks on the operating pop-ups, and
run the line for at least an hour, search for wet spots, and if you
still can't find one, "stomp" [+] along the ground where the line is
most likely to be (between the three heads). Unless it's buried
real deep, you should be able to find any tubing leaks by where
you fall in ;-)

While you have the bricks on the working pop-ups, recheck
your water flow and see if it goes down drastically. If not,
you have a leak. If it does, then you have an obstruction.


Thanks, Chris, for the suggestions.

There is a misunderstanding about my configuration. There are five, not
three, heads in the problem zone. The two lowest ones dribble; nothing
at all out of the other three. If the dribbling ones were plugged up
with grit, that would restrict flow through those heads and increase
pressure to the remaining ones, which should then have a greater
tendency to rise and squirt water farther than when all five are
working. Am I missing something?

Ray