Kitchen & grease lines

Why the kitchen is its own problem

Everything that goes down a kitchen sink is warm. Fat and oil stay liquid all the way through the trap and then cool on the pipe wall, a film at a time, catching coffee grounds and rice and anything fibrous on the way past. The line does not block at a point; it narrows along its length, which is a completely different failure from a root ball or a dropped object.

That is why a cable disappoints here. It bores a hole through the middle of the deposit, the sink runs beautifully for the rest of the day, and the hole closes again with the next few weeks of washing up. Nobody has done anything dishonest; the wrong tool was used on a wall problem.

What works, and what does not

• Jetting works, because the nozzle scours the wall for the full circumference and the flow carries the material out rather than leaving it further down the line.
• Enzyme and bacterial products have a real and modest role in slowing build-up on a line that has already been cleaned. They do not open a blocked one, and we will not sell them as though they do.
• Caustic openers are the wrong thing in a kitchen line, and the person who eventually has to open the trap is going to meet what you poured in.
• Hot water and detergent moves grease a few feet down the pipe. It does not remove it from the system, and on a long flat run it makes the far end worse.

A disposal does not make food disappear

A garbage disposal grinds; it does not digest. The pieces are smaller and they still have to travel a horizontal pipe with an eighth of an inch of fall per foot, and they stick to whatever is already on the wall. Coffee grounds, egg shell, rice, pasta and anything stringy are the reliable offenders. None of this means the disposal is broken.

The one place a schedule is honest

We say elsewhere on this site — firmly — that a recurring cabling on a residential root problem is a subscription rather than a service, because the underlying defect never gets addressed. A commercial kitchen is genuinely different. There is no defect to repair: the line is sound and the building's own daily output is the cause, and it will be the cause again next quarter whatever anybody does. A scheduled jetting there is maintenance in the ordinary sense, the same way changing a filter is.

What still has to be true is that the schedule is set by how fast that line loads up, measured on camera, and revisited — not sold as a standard interval to everybody with a kitchen. And on a commercial site the grease interceptor is part of the same conversation: a trap that is not being pumped on its own schedule will keep filling the line no matter how often the line is cleaned.