Two years ago we trenched and installed 400' of drain tile in our yard. We dug up three different clay tile drainage lines running perpendicular to our trenches. All of them were packed solid with clay soil and sediment. My basement floor drain is glazed bell hub clay tile and is clear for over 200'. It's 152 years old.
source https://www.inspectorsjournal.com/topic/19166-clay-sewer-pipe/?do=findComment&comment=176218
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