Question
QUESTION: i have a property at the beach in jax fl i have a 13 zone system fed from a deep well with a filter system on it. i have 1 zone that i contstantly have to clean nozzle screens out they have have sand in them i have turned all heads off and ran zone for an hour to see if i could find a break but no luck do you have any suggestions

ANSWER: Is that the only zone you have sprays on? Is there elevation change in that zone?

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QUESTION: well the whole property is sprays there is some slight downward elavation but not much it also takes longer for that zone to come on have already replaced valve im wondering were ever the zone line pipe comes across in sleeve if it may have a crack in it. been a irrigation contractor for 25 years but im stumped on this problem.

Answer
I was just checking to see if the sand could have been getting into the line when a zone was shutting down. As you know if a zone takes longer to fill when activated that usually means its because the lateral line needed to fill up. It's hard to troubleshoot something you can't see for yourself.  You can always pressure test the zone with air but that won't tell you where the break would be. Up north we use air compressors to troubleshoot for hard to find leaks.  Let me know what you find.