The drain field, where the leach lines are laid, is usually made of a layer of crushed stone.

Name: The drain field, where the leach lines are laid, is usually made of a layer of crushed stone.
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The drain field, part of a septic system, typically includes a layer of crushed stone or gravel where the leach lines are laid to help with filtration and proper drainage of effluent into the surrounding soil.

The Drain Field, Where the Leach Lines Are Laid, Is