Start by identifying where the backup begins. If water is rising in the gully (the outdoor trap where your kitchen waste pipe exits), the blockage is likely between that gully and the first manhole. Lift the drain cover using a flat-head screwdriver to inspect for visible obstructions.
If the above steps don't work, you may need to use more advanced techniques to unblock the drain: how to unblock kitchen drain outside
To make sure the drain was truly clear, Sarah ran the kitchen sink at full force for two minutes while Tom watched the outdoor drain. Water flowed freely, with no backup. Then, for good measure, she poured a bucket of water mixed with a cup of white vinegar down the outside drain to neutralize any remaining odors and break down microscopic grease. Start by identifying where the backup begins
“It’s not the inside pipes,” her husband Tom said, peering under the cabinet. “The water’s draining, just… slowly.” If the above steps don't work, you may