Septic smell from washing machine


M

Mitch

We are getting a septic smell from the washing machine drain (which is
in the wall of the main floor).

It's the only place in the house we get this.

Could this be due to the water blasting through the trap with too much
force? If so, how do we rectify it?
 
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S

Speedy Jim

We are getting a septic smell from the washing machine drain (which is
in the wall of the main floor).

It's the only place in the house we get this.

Could this be due to the water blasting through the trap with too much
force? If so, how do we rectify it?
It could indeed be what you suggest. If so, it means the trap was
improperly installed.

The trap should have a vent connection just downstream from it.
This allows air to be sucked in as the flood of water from the
washer passes by. That prevents the water in the trap from all being
siphoned out at the end of the flow.

Try this test when you have the odor:
Slowly pour a quart of water into the drain opening where the hose goes
in.
If the odor goes away after a while, the trap was dry.
If the odor does *not* go away, there is no trap <ugh>.

How you fix this will depend on what access you can gain
to the trap connections.

Pick up a basic plumbing repair book (library or even at HD)
to see how traps and vents are supposed to be connected.

If no vent, you *may* be able to use a mechanical vent to
solve the problem:
http://www.plumbingsupply.com/autovent.html


Jim
 

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