"Oren" wrote

Sometimes they may have small rocks or sand, etc., in the sprinkler
head. Using a conical shaped screen will prevent the rocks for the
most part. I have seen them not pop up when rocks are in the pipe.
Just a little cleaning fixes this.

As far parts, I tend to keep old heads. springs, nozzles, seal, etc.

I have an in line one inch filter. About as big as two quart mason jars
stacked on top of each other. I was having a problem with one of my valves,
and on disassembly, found a snail shell. My ag water is not filtered very
well. This is doing the trick, although I may go to a smaller mesh, and
more frequent cleanings. My problem is the slime that comes through, as
well as rocks and shells. Yesterday, I had to disassemble my line of big
gear drives, flush the lines out, and reinstall the cleaned drives. Worked
like a charm. Now have to install 2 hp booster pump for times when my
pressure is low due to being at the end of the line.

And as for keeping spare parts, we don't throw away anything here at Green
Acres. Hooterville is twenty miles away. And the store in Pixley is always
closed.

Steve