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Fats, oils and grease (FOGs) clog drainage pipes. The FOGs sticks to the sides of pipes decreasing the pipe’s capacity and eventually blocking the pipe entirely. Other problems include a reduction of a private treatment system’s performance, smell issues and eventual property damage and pollution.


What are FOGs?

Common sources of FOG include meat fats, dairy products, food scraps, cooking oils, baked goods, sauces, dressings, sandwich spreads, gravies, marinades, dairy products, shortening, lard, butter and margarine.

What are Grease Traps and Grease Interceptors?

Grease traps have been used since the Victorian era. They are used to reduce the amount of fats, oils and greases (FOG’s) that enter public or private foul sewer. They are installed on the foul sewer from the kitchen and are not served by any other drainage system such as toilets. They can be passive (simple tanks) or active (often electrical devises) and can be located above ground, below ground, inside the kitchen or outside the building. FOGs are captured with the trap until it is cleaned out.

Who needs a grease trap?

Most Local Authorities require a system to prevent grease and fat from flowing into the main sewerage system. As a rule of thumb any commercial kitchen should be fitted with a grease trap to prevent FOGs causing blockages and inhibiting sewage treatment processes.

Domestic properties do not produce enough FOGs to warrant the installation of a grease trap but there are always exceptions e.g. the home starter bakery making breads and pastries for farmers markets!

Even if it is not required, you may want a Grease Trap to help prevent clogged drains from stopping work.

Can I minimise FOGs in my drainage system?

Yes! It can be as easy as preventing any fat, oils and grease entering the drainage system. Wipe all pots and pans out with kitchen roll and bin it. Dispose of waste oils (e.g. from deep fat fryers) in drums and recycle it. Minimising the amount of food particles going down the drain will also help decrease the risk of blockage.

Why can’t I just dose my kitchen drains?

Products such as detergents and grease dosing systems often only serve to emulsify grease which can pass the problem further down the drains causing problems elsewhere.

How do I choose the right Grease Trap for my application?

The size you need is determined by the amount of water going down your drain. If you have a choice, it is usually best to choose the largest size, giving the most efficient operation and longest cleaning cycle. If you would like help choosing, just let us know and we will be glad to help with your selection.