Drain maintenance for restaurant and cafe kitchens

Most of what ends up in the kitchen drain comes from the dishwashing counter. If plates brought back by the waiting staff are scraped into the bin at a scraping point before they reach the sink, the amount of solid waste the drain has to carry drops noticeably. Wiping grease from pots and pans with paper works on the same logic.

These habits should be explained to new staff on their first day and written somewhere visible in the dishwashing area. In cafes the step most often skipped is rinsing espresso machine grounds down the sink. Grounds settle like sludge in the water and harden once they bind with grease.

The end of the day is the easiest time to check the drains, because the water flow has stopped and the line is expected to rest until the next day. If the dishwasher or whoever closes follows a short checklist in the same order every evening, small build-ups are cleared before they grow.

Floor drain baskets are the most neglected part of the kitchen. When a basket is full, mop water and spilled liquids flow over the strainer and crumbs go straight into the pipe, while emptying the basket takes only a few movements.

Weekly jobs are checks that take too long to fit into the end of the day but turn into blockages if neglected. Monthly jobs focus on the parts of the line outside the kitchen and on the grease trap. Writing who is responsible next to each item stops the job being skipped on the assumption that "someone will do it anyway".

Even if end-of-day cleaning keeps the sinks running, the grease clinging to the pipe walls thickens over time. To remove this layer, the kitchen line needs to be cleaned with high-pressure water, and the drains on the line cannot be used during the jetting. For this reason the job should be planned for after the evening service closes or before the morning opening.

Before the team arrives, the area in front of the floor drains, the trap cover and, if there is one, the cleanout access point is cleared, and the cabinets under the sinks are emptied so the traps are easy to reach. If the business is on the ground floor of an apartment building, it is a good idea to tell the management. If the jetting is done on the shared line, the flats on the upper floors may be asked to use less water at that time. A camera inspection after the jetting reveals problems that are not grease, such as a sagging pipe or a gradient fault.

A simple one-page table makes kitchen drain maintenance independent of individuals. Even if the shift changes or the dishwasher leaves, the new person can see what was done and when. Because the log also shows in which periods blockages become more frequent, it helps you spot causes such as a menu change, a new fryer or growing takeaway orders.

Showing the log when you call a technician also helps. If it is known when the last jetting was done and what layer thickness was measured in the trap, the location of the problem is found more quickly.

Even in a kitchen with regular maintenance, some signs show that there is a problem deeper in the line. In that case the line needs to be inspected rather than treated with a chemical opener. These products can wear down plastic drain pipe and rubber seals, burn staff if they splash, and instead of dissolving the grease layer they only open a narrow channel through it.