re: Wash machine drain backing up

quote:

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it's old cast iron

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My house was built in 1974. I had the same problem and had to replace my rusted out 2" cast iron washing machine and kitchen sink drain lines. Busting up the slab was a mess. I would try one of those jetters from amazon you attach to a pressure washer first.

For several years before I replaced the cast iron pipes. I used a fernco reducer and hose clamps to prevent the stand pipe from overflowing. The washing machine pipe backup was forced into the kitchen sink.

I hope your cast iron pipes aren't toast