How It's Made: Septic Tanks

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NARRATOR: Septic tanks are the perfect sewage treatment

solution for houses that aren't connected to a sewage network.

The tank collects and treats domestic wastewater

using a bacterial process to decompose waste.

It filters the dirty water before recycling

it back into the ground.

Septic tanks are usually made of concrete

and have access covers on top.

The waste treatment process takes place

in separate chambers inside the tank.

Steel bars called rebars reinforce the

concrete structure of the tank.

A welder assembles the rods to form a cage,

then he spot welds the rebar with a mid welding torch.

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