Elk Grove, CA (Zone 8A)
|My irrigation system pipes just started humming when the automatic zone-valves cycle off. Any idea as to what is going on? Is it a defective anti-syphone valve?
|Answer from NGA
June 16, 2005
|It could be a faulty anti-syphon valve, or it could be that the water is draining slowly before it bubbles out of the sprinkler head; perhaps because there's air in the pipes. You can try flushing the pipes out to see if that fixes the problem. If not, anti-syphon valves are relatively inexpensive. I'd replace it.
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