Grease trap solutions: when we are speaking to customers and potential customers about grease trap servicing, we often answer questions based on something like this: “why is my grease trap still full after in was pumped recently”? or ” will you charge me for 1000 litres (assuming it is a 1000 litre grease trap) of it is not full of grease?”


>Download Now: Free PDF Business Owners Guide To Grease Trap Cleaning Services


Table of contents for this article include: 

I. Why is my grease trap full after service?
II. Common problems with grease traps

Why is my grease trap full after service?


These questions are based on a misunderstanding of how grease traps (or as they are also known – grease interceptors) work.  This detailed article on wikipedia explains how a trap works.


In simple terms – the grease trap prevents oil going down the drain into the sewerage system and preventing blocks or issues with the municipal plumbing.


Each metro region has its own specific legislation from the local water authority stating which business types need grease traps, how big they should be and how often they should be pumped out / or cleaned. See the Sydney Water pages here.


Grease trap solutions – how does the grease trap work and why is it always “full”


A grease trap or grease interceptor basically is a device filled with water and a filtering system – as water enters the trap from the sinks etc in the kitchen – the trap separates the water from the grease.


The grease is kept in the trap and the water is released to the sewerage system.


Overtime, the trap will steadily fill up with grease i.e. it will be pure water after it has been pumped out and cleaned and then will steadily increase from 0% grease component to 100% if it is not cleaned on a regular schedule (see how often should grease traps be cleaned).


As the trap becomes clogged with grease, the risk of overflowing or a major issue (that could result in significant fines for your business) becomes a possibility. In this context you may need an expensive emergency grease trap cleaning.


Waster offers flexible waste services, including grease traps cleaning which you can arrange easily through our online waste shop:



Arranging reliable grease trap cleaning for your business need not be rocket science.


Trap grease cleaning


Choose a reputable company and ensure you keep records of the services as they are performed will ensure you do not receive a fine from your local water authority of face any unpleasant situation like an overflow or blockage.


Waster makes your grease trap solutions easy – as we operate on flexible 30 day agreements and do not charge hidden fees.


Check out the quick video below which provides answers to common questions.


Of course – you can also give us a call and our friendly customer service team will be very happy to help you with any questions.



Common grease trap problems



As a company that provides trap grease pit cleaning – we receive a wide range of questions relating to services, issues and problems.


When it comes to grease traps – not many people know that much about the topic. A grease interceptor is a simple system used to trap grease for restaurants, cafes and food service businesses.


However, this simple system leads to many misunderstandings.


Waster services for grease trap cleaning


Waster is a business focused on helping small and medium Australian companies with their waste and recycling services.


Traditionally, small businesses were faced by higher costs and more negative terms and conditions such as automatic rollover clauses (evergreen clauses) and annual, twice annual or even three times per annum prices rises.


When you work with Waster – all your services from cleaning trap grease interceptors to general waste bins or sanitary services are based on flexible 30 day agreements.


You can easily arrange all your required waste services online by pressing the blue button below:


Common issues with trap grease interceptors


One of the most common questions we have in grease trap cleaning – is if you can tell if it has been cleaned by looking in it.


Many customers have called us after a service and said – “my trap is still full – it looks like it has not been cleaned.”


Another query is if there should be grease in the trap after a cleaning.


Should a grease trap be full after a service?


The answer is yes.  When a grease trap is cleaned the water and grease is pumped out and the sides are scraped down. The trap will then refill with water.


Once the trap has been cleaned – it will still appear to be full i.e. full of water. If the trap is not cleaned for a long period – it will gradually fill up with more and more grease.


This means that no matter when you look in a trap – it should always appear “full”.


There is still grease in the trap – it has not been cleaned!


If your trap was cleaned last week – should you expect to see grease in it when you open the trap?

Trap grease interceptor


The answer is – yes, probably. If your restaurant is busy – a lot of waste water will go down the sink in a week or even a day.


As the interceptor works to trap grease and the grease will float – grease will appear at the top of the trap.


It will thus appear to be “full of grease” – even if in reality – 99% of the trap is water.


It is for this reason that a scheduled service is important. A schedule ensures that the trap is cleaned regularly and is not based on human error or judgement.




The main reason not to look in a grease trap is it smells and it is unpleasant.


It also has very limited value – as you can not tell if it needs cleaning or not.


Check out this video below as to what a “fat berg” looks like in a city sewer system – i.e. when the trap grease procedures are not working correctly.



grease trap cleaning cta