Outside Drain From Kitchen Sink Blocked

: When warm grease is poured down the sink, it cools and solidifies inside the pipes and the outside gulley, eventually forming a thick, waxy plug.

This is a classic “nuisance” blockage driven by kitchen habits, not a design flaw. With correct diagnosis and a drain rod set, most homeowners can clear it in under an hour. Recurrence is the real red flag—if it returns monthly, invest in a one-time CCTV survey to rule out pipe damage or root intrusion. outside drain from kitchen sink blocked

| Cause | Description | Typical Signs | |-------|-------------|----------------| | | Solidified grease from washing pans/dishes | Slow drainage, recurring blockage, white/grey solid mass | | Food debris | Rice, pasta, coffee grounds, vegetable peelings | Gritty blockage, often mixed with grease | | Soap scum | Reaction between soap and hard water minerals | Chalky, pasty build-up inside pipe | | External debris | Leaves, dirt, or silt entering the open gully | Blockage at the grate or first bend outside | | Pipe damage | Cracked, displaced, or root-invaded clay/plastic pipe | Recurring blockage, sinking ground above pipe | : When warm grease is poured down the

: A distinct "rotten egg" or sulfur smell coming from the drain area due to stagnant water and decaying organic matter. Recurrence is the real red flag—if it returns

: Pouring a large pot of boiling water mixed with grease-cutting dish soap can help melt and move solidified fat.