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Old 07-25-2011, 11:21 AM
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DanaMac DanaMac is online now
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Join Date: Mar 2002
Location: Somewhere in the state of CO
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Restricted flow by roots or rocks as Fimco stated. or leaking wiper seals at the heads. Or the zone is stretched on GPM. Or combination of all of it. Try nozzling down to start, and do the check valve heads that WB mentioned, at least on the lowest one or two heads.
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