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armyash

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Just been to this. We managed to clear it with a plunger but even when draining it would keep backing up and not go away. Never seen it before.

Theres a normal overflow pipe and also a down pipe which were both letting water out. Still think there will be issues, some sort of restriction. Would some thing like this have a non return valve? Seems unlikely but thought someone might know.

Approx 10-15m to discharge

View attachment DSC_2891.JPG
 
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