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Monthly Archives: October 2018

  • How Does a Grease Trap Work?

    A Brief Introduction to Grease Traps…Getting up to Speed

    Grease trap noun – def. ‘: a trap in a drain or waste pipe to prevent grease from passing into a sewer system’ Source: Merriam-Webster.com

    Having recently become somewhat of a buzz word in the commercial foodservice industry and often associated with the terms fatberg and FOG (fats, oil and grease), grease traps are not a new thing. Surprisingly, the idea of a grease trap specifically designed to prevent fats, oils and grease from entering the sewer system, has been around since the Victorian era (late 19th Century) where it seems that troublesome drain blockages also appear to have caused issues. These first primitive boxes are what all grease traps today are based on.

    Important Legislation

    UK Water Industry Act 1991 section 111

    “…no person shall throw, empty…into any public sewer or into any drain…communicating with a public sewer, any matter likely to injure the sewer or drain, to interfere with the free flow of its contents…” Source: https://www.legislation.gov.uk/ukpga/1991/56/section/111

    All businesses must work within the law. Installing an appropriate grease trap is essential to ensuring every commercial kitchen complies with regulations.

    How Do Grease Traps Work?

    The primary feature of a grease trap is to prevent any untoward kitchen matter (anything other than water) from entering the sewer system; this includes FOGS and food debris etc.

    There are different types of grease traps for commercial kitchens on the market, often being broadly broken down into two main sections - passive/manual traps or automatic separators/GRUs (grease recovery units). Whether attached to sinks, ovens, warewashers or elsewhere in the kitchen where FOG is produced, grease traps will perform the same basic function, all be it with slightly differing approaches.

    The size of grease interceptor required will depend on the flow rate of fluid through the kitchen either through sinks, warewashers or equipment; low flow rate = smaller trap, high flow rate = larger trap. With a full range of sizes on offer to suit every flow rate, the basic design works in the same way whatever the dimensions.

    Manual Grease Traps

    Typically a durable stainless steel or epoxy coated steel box designed to trap grease until cleaned out.

    How passive grease traps work


    • Waste water or effluent enters the grease trap and fills the tank
    • A system of baffles may be used to slow down water and allow FOGs to cool and effectively separate
    • Solids settle/sink. Some models may have a strainer to catch solids, reducing quantity settling in the bottom of the trap
    • FOG floats (being lighter than water)
    • Outlet syphons water through to the drainage system

    FOGS and solids sit in the trap until emptied and cleaned (a task advised when the box is approximately 25% full). The stagnant waste can often lead to bad smells, increased risk of pest infestation and risk of unsanitary kitchens…not ideal. Passive grease trap cleaning, whether carried out manually or with a pump, isn’t an appealing task and it’s always advised to allow professionals to do the job (although this will lead to ongoing operational costs). Be aware that if passive grease interceptors are neglected for too long they will become ineffective as the tank fills with FOG.

    Passive grease traps can be positioned above ground, typically where the source of FOG is or underground in an external location. Whether opting for a small indoor or large outdoor model, traps will function in the same way.

    Did you know? In kitchens where FOG production is high, it may be beneficial to double up on grease management systems. While traps will remove a hefty amount of FOG from waste water, they aren’t 100% foolproof. To maximise effectiveness and minimise FOG ending up in the sewer, two traps can be placed side by side; any unsavoury elements escaping the first trap will be caught by the next. It’s always recommended to have a site survey carried out by an expert; they’ll let you know what you need and make sure grease management solutions are as effective as possible.

    Dosing Systems

    Dosing systems are sometimes used in conjunction with passive grease traps. Consisting of biological treatments made-up of enzymes and bacteria, the solution is introduced to the system prior to effluent entering the grease trap. Helping to break down FOG, dosing systems and dosing pumps are not a standalone grease-busting solution, instead designed to enhance function of the basic trap.

    Automatic Grease Traps

    Automatic grease separators are often considered a more sophisticated grease removal system, solids and grease being separated from grey water into collection containers ready for daily disposal.

    How a Goslyn automatic grease trap works


    • Waste water enters the grease trap
    • Passes through a filter that collects solids
    • Water mixed with FOG flows through to main chamber
    • Non-mechanical GRUs such as Goslyn units will have a small heater to prevent FOG from cooling and solidifying; utilising hydro-static pressure to force FOG out into external oil container. Mechanical models allow FOG to cool and separate to the surface (as with passive) however regularly skim the top layer into a separate collection container
    • Water continues the journey into the sewer via the outlet, unaccompanied by any unwanted additions

    FOGs and solids are effectively separated into independent containers and can be easily disposed of by members of staff without needing to shut down the kitchen and experience enforced down time. A major benefit of automatic grease separators is that they continuously remove FOGs to maintain the ongoing efficiency of the trap.

    The fatberg problem is an issue at a domestic and commercial level however commercial foodservice premises will often produce considerably more offending material, with takeaways typically being the biggest contributors. Often the escape of fatberg ingredients from commercial kitchens isn’t intentional; businesses are just unaware of how working practices are creating a problem. The education of businesses and staff (and effective grease management solutions) is key to combating the rise of the fatberg once and for all. Make sure your kitchen is prepared.

  • Product Spotlight: The Goslyn Grease Recovery Unit


    The Goslyn Brand | GRU Mechanics…or Lack of Them | More Than Effective Separation of FOG | Models in the Goslyn Range


    Grease traps have emerged on to the market in a big way what with the public’s attention being drawn to those hideous fatbergs clogging up sewer systems. To tackle those immense conglomerations of fats, oils, grease, baby wipes and condoms plus anything else people deem to throw down the drain, businesses need a tried and tested product that’s up to the job.

    Enter the Goslyn Grease Recovery Unit!

    Here we put the Goslyn GRU in the spotlight and discover exactly why this grease trap system is so acclaimed.

    The Goslyn Brand

    Goslyn is a trusted brand within the grease trap industry. Based in the US its impact has been felt around the world, being used by many major, big-name operators. Its popularity and success is undoubtedly due to its effectiveness and efficiency in managing fats, oils, grease and solids (FOGS) in foodservice operations.

    Providing the last major line of defence against the onslaught of FOG, never before has the saying ‘prevention is better than cure’ been more apt. The experts at Goslyn have developed a range of grease recovery devices to make this philosophy a reality.

    GRU Mechanics…or Lack of Them

    Acknowledging that FOGS are notoriously damaging to the environment and the sewer systems, Goslyn have made it their mission to design and perfect the manufacture of grease interceptors that perform to exceptional standards with a 99.6% separation rate. The outcome of all their dedication and hard work is a grease management solution that successfully filters solids of 2mm+, separating fats and oils and ejecting nothing but water into the drainage system. Leaving nothing to chance, all GRUs in the range also feature a manual flush valve to remove any fine residual sediment that may have escaped the primary filter.

    “The Goslyn Separator is a patented, immiscible liquid separator which operates under hydro static pressure and has no moving parts.” Goslyn Environmental Systems

    Sounds complicated right? Well, it isn’t.

    The design consists of a primary filter to remove solids; the first point of contact for effluent entering the trap. Following this filtering process, the oil and water mix travels through to the main chamber. The liquid is heated to prevent fats, oils and grease from solidifying; the FOG naturally floating on the surface of the water. This is where Goslyn utilise the science behind hydro static pressure to force FOG up through the oil valve and through to the collection container. Any fine particulates sink to the bottom ready to be manually flushed out daily. All remaining water continues through the outflow and into the sewer system free of fatberg feeding materials.

    Breakdown of Goslyn grease recovery unit design

    More than Effective Separation of FOG

    While the Goslyn grease recovery unit is undeniably effective at preventing kitchen cooking waste from obstructing drains, they also offer so much more.


    Gone are the days of the messy cleaning associated with passive (aka manual) grease traps. Cleaning the system is simple and can be carried out in house by any trained member of staff. It takes just a couple of minutes per day to empty the solids filter, flush any additional particulates from the main chamber and responsibly dispose of all accumulated FOG. This can be disposed of together with other used kitchen oil for total convenience. An additional benefit is a reduction in the odour typically occurring in passive tanks. As FOG is continuously removed and particulates either filtered or flushed, organic matter doesn’t sit stagnant in the tank causing a stink.


    All automatic grease traps are considered more efficient than manual alternatives. As passive models store and hold FOG until emptied, a point will eventually be reached when the trap will no longer be effective until after cleaning has been carried out. FOG is continuously removed from a GRU making it capable of efficient performance 24 hours a day, 7 days a week.


    Heavy duty construction using high grade 304 stainless steel guarantees an end result that is durable, hard-working and built to last.

    Compact in design with a minimal footprint, these acclaimed grease separators are suitable forGoslyn Grease Separator both small and large kitchens that need something unobtrusive but still capable of delivering massive performance.

    The design lends itself to versatile positioning; generally wherever there’s FOG, a Goslyn grease recovery unit can be installed. Equally effective whether placed below a sink, connected to a dishwasher or even used in conjunction with combi ovens or rotisseries, performance is always guaranteed.

    All grease systems use a standard three pin plug, requiring only minimal electrical power to operate the integrated heater (so don’t worry about big electricity bills). The heater is essential to warming the waste water and maintaining the fluidity of FOG to effectively assist and facilitate efficient grease separation.

    As a non-mechanical system, these units benefit from no moving parts. This means there’s less to break or go wrong, resulting in a simple, straight forward grease management solution. There’s no need for the use of chemicals; just the natural flow of effluents will suffice.

    No hassle, minimum fuss, maximum result.

    Industry Compliant

    As you would expect from any big set-up, the Goslyn series fully complies with industry codes to guarantee that businesses are always protected. All products are capable of reducing FOG below 100ppm, well below industry standard guidelines. With so many certifications backing up the brand, businesses can always be confident that they’re investing in quality equipment that works.

    Goslyn certifications

    Models in the Goslyn Range

    • A Trap for Every Flow Rate

    The needs of every business will differ depending on the size of the kitchen, the equipment that the GRU has to serve and the litres per minute flow rate typically experienced. To accommodate all variables Goslyn have a range of capacities available to meet all demands. Choose from GOS20, GOS40, GOS60 and GOS80, each increasing in size and suitable for any scale of business. Also on offer is a low profile model where the height to the outlet is reduced.

    • Can Be Retrofitted

    Thinking of installing a Goslyn automatic grease recovery unit? There’s no need for a whole kitchen make-over. All traps can be easily retrofitted into any premises allowing everyone to take advantage of this popular grease management system.

    • Manufacturers Warranty

    With a massive 5 year warranty supplied as standard, confidence in the product and the brand is instilled.

    Grease traps have never been more essential in the foodservice industry and so should be considered an investment just like any other piece of commercial catering or refrigeration equipment. While the initial investment of automatic units is higher than manual alternatives, remember that there will be no ongoing costs incurred thereafter such as cleaning, chemicals and pump out costs etc. Goslyn grease separators are proven to generate savings – something that every canny business loves to hear.

    For more information or to discuss options get in touch with our sales team today and take the first step to a cleaner, healthier drainage system and environment.

  • How Automatic Grease Removal Units are Better (and Cheaper) than Passive Grease Traps


    Fats, oils and grease clogging up the sewer pipes have made big headlines in recent years with great emphasis placed on the importance of effective grease traps and grease management systems. This is especially important for commercial foodservice operations where FOG’s will typically be found on a greater scale. With a little research into the arena of grease traps it soon becomes apparent that there are two main types of systems – passive (manual) or automatic (grease recovery units).

    Goslyn Grease Separator

    Grease Removal Units (GRU) also known as automatic grease traps have the same primary function as manual alternatives. Both designs deal with FOG and prevent troublesome fatberg ingredients from entering the sewer system. There’s no question that employing a grease trap of some form is better for your business and better for the environment.

    Both models separate FOG, solids and water within the tank. By slowing the flow and letting the wastewater cool, each element naturally isolates and separates – solids sink, water remains in the middle and FOG’s float. It is how each of these elements is dealt with once they have been isolated that differentiates between a passive and automatic grease interceptor. So, is one system better than the other? Read on to find out…

    Why Choose Automatic Grease Removal Units?

    Elaborating on the Grease Combatting Process

    It’s already been established that the core principle of a grease trap is the same, whatever the design however a GRU takes the process a little further.

    Whereas manual units will simply contain and hold kitchen nasties until cleaned out, automatic units will systematically skim the top layer of the tank where the FOG sits, depositing it into a collection container. The contents of the container can be disposed of easily (and responsibly) when necessary without needing to open up and access the interior of the grease trap.

    Any solids get caught in the filter – the first point of contact in the grease trap for grey water. This filter is readily accessible and can be easily removed for disposal of solids.

    Water is free to continue flowing through to the drainage system minus any harmful bits that could potentially cause a blockage.

    Savings that Add-Up

    It’s undeniable that a GRU is more expensive to buy than a passive trap, but consider the biggerPiggy bank savings picture. In the long run automatic systems prove to be much more cost effective.

    Yes, they may cost more initially and they require daily maintenance (although it’s minimal) to empty the solids filter and FOG collection container. Some models also need an electricity supply to power and carry out the programmed skimming of FOG (albeit only generating low running costs). However even with all of these factors taken into consideration, over the course of 3+ years the potential savings that can be made are substantial. Any member of staff can perform in-house maintenance rather than hiring specialist services and there should be no need for a costly in depth kitchen sanitisation after each clean. You can also rule out potential loss of earnings resulting from kitchen down time. Surely this will make the extra set-up expense worthwhile?

    Performance, Efficiency and Convenience

    While cost is obviously a major factor that needs to be considered when choosing a grease trap it shouldn’t be the only point of reference. Automatic GRU’s are simple to use, convenient to install and reliably effective at preventing FOG from clogging up the pipes. Throw in reduced odours (FOG doesn’t sit stagnant in the tank) and easy cleaning then the question becomes ‘Why shouldn’t you choose an automatic grease removal unit’?

    Basic ScienceScience molecules and flasks

    The more grease there is in a grease trap, the less effective and therefore efficient it is. As GRU’s remove FOG from the tank into a separate container on a daily basis there’s never that hefty build-up of grease that there would be in a manual unit. This makes automatic GRU’s undisputedly more efficient at dealing with effluent materials than manual alternatives.

    Passive Grease Traps

    As the quantity of grease in the tank increases over days and weeks, performance and efficiency will decrease with a sudden decline experienced when the trap is full (signifying that the trap has stopped working).

    Automatic Grease Recovery Units

    As grease is separated and removed from the trap regularly, the quantity of FOG present at any one time is minimised. The quantity of grease in the tank remains relatively low enabling performance and efficiency levels to remain high; much more effective at keeping fatberg contributors at bay.

    Helping to Make the Right Decision

    Investing in the most suitable grease trap, especially when choosing to go automatic, is a big decision. Not only does it benefit the business as a whole and contribute to a healthier environment but can also mean the difference between abiding by legislation and incurring a hefty fine.

    To guarantee that the right decision is made a site survey is recommended.  UK Grease Traps Direct can arrange this service free of charge to assess the type of grease trap required and the size and quantity needed. Get in touch today for more information.

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