Unblocking Drains in a Commercial Kitchen: How to Use and How to Prevent

In a commercial kitchen a blocked drain is rarely an accident. It is grease that has been building up for weeks and picked the worst possible day to close off the pipe — usually in the middle of service.

The difference between a home and a restaurant kitchen is volume: where a household sends the occasional scrap down the drain, a kitchen sends litres of grease a day. So the problem is not solved only when it shows up — it is solved on the calendar.

Unblocking: step by step

This guide covers the use of the Mistolin Liquid Drain Unblocker [1000ML].

1. Identify where the blockage is — sink, wash-up sink, floor drain or grease trap. Treating the drain when the problem is in the trap wastes product and time.
2. Apply the product directly into the drain — around 250 ml for light blockages, up to 500 ml for established ones.
3. Leave it to work for 15 to 30 minutes — that is the time the product needs to dissolve the residue. Forcing it early speeds up nothing and means doing it again.
4. Rinse with hot water — this flushes the dissolved residue away and stops it settling again further along the pipework.

If the flow does not improve after a second application, the problem is no longer in the drain: it is in the pipework or the grease trap, and that calls for mechanical intervention.

What actually blocks a commercial kitchen

• Cooled grease. It leaves the fryer as a liquid and solidifies ten metres later, inside the pipe. It is by far the most common cause and the least visible.
• Fine debris. Whatever goes down the drain unnoticed — flour, sauces, grounds — binds to the grease already deposited and forms the plug.
• A grease trap with no maintenance. Once it is full it stops retaining and the grease carries on into the network. The blockage shows up downstream, far from the cause.

Prevention: what avoids the emergency call-out

A pipework maintenance plan costs a fraction of a call-out during service, and it is what separates a kitchen that never stops from one that always stops on a Friday night.

• Preventive application on a fixed cycle — weekly or fortnightly depending on volume, outside service hours and with the drain left unused during the contact time.
• Never pour hot grease down the drain — it cools further along and settles where nobody can see it. Collect it and dispose of it as waste.
• Regular cleaning of the grease trap — with a record. Under a HACCP plan, it is one of the points you are asked to demonstrate.
• Degreaser in the end-of-day clean — dealing with grease on the surface stops it reaching the pipework. See the range of professional degreasers.

For whoever runs the operation

If the kitchen blocks up regularly, the problem is not the product used to clear it — it is the absence of a cycle. We build the hygiene plan with you, including pipework maintenance, and train the team responsible on site.

See the offer for restaurants or the Mistolin Liquid Drain Unblocker.