
Grease and fat are some of the worst offenders when it comes to blocked drains. When washed down the sink, they congeal and solidify, sticking to the sides of the pipes and causing blockages. This can lead to foul odours, flooding, and even severe damage to pipes. While boiling water can be used to dissolve fat in drains with metal pipes, this method is not suitable for plastic pipes as it may soften or melt the joints. Chemical cleaners can also be effective, but they can be dangerous and harmful to health, as well as causing corrosion to pipes. Other methods for clearing blocked drains include using a plunger or drain snakes, while prevention methods include using a fat trap catcher and wiping plates with paper towels before washing.
Characteristics and Values Table
| Characteristics | Values |
|---|---|
| Prevention | Add a fat trap catcher to your kitchen and bathroom sinks, wipe plates with paper towels before washing, place excess grease into bottles, and dispose of oils by pouring them into a bag or container and throwing it in the trash |
| Mechanical methods | Use a plunger to force air through the water and dislodge the clog, drain snake or cable, or a sink plunger |
| Hot water | Pouring boiling hot water down metal pipes can help dissolve grease and fat, but it may move the blockage further down the pipe and risk scalding |
| Hot water and bleach | Can clear drains once most of the blockage has been manually removed |
| Chemical cleaners | Caustic, oxidizing, and acid cleaners rely on a chemical reaction that creates heat, dissolving fats into smaller pieces that can be rinsed away. However, they can corrode metal or plastic pipes and damage the plumbing system. |
| Organic solvents | Can dissolve fat but will also dissolve plastic plumbing |
| Enzymatic cleaners | Can dissolve fats slowly, especially in cold conditions |
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What You'll Learn

Hot water can help dissolve fat in pipes
One suggestion is to use a plunger to force air through the water, dislodging the clog. While this may provide temporary relief, it is not a long-lasting solution. Calling in an expert to clear the drain is advised for persistent blockages.
To prevent fat buildup in pipes, it is crucial to be mindful of what goes down the drain. Avoid pouring vegetable oil, cooking grease, or any fatty liquids down the sink. Instead, scrape dishes and wipe them with paper towels before washing. You can also use a fat trap catcher, a metal strainer that allows water to flow through while catching larger solid items.
Another way to prevent fat buildup is to place excess grease into bottles, allowing you to reuse the oil for cooking. Additionally, annual preventative maintenance is recommended to treat and clean pipes. This can help break down fat and grease buildup and maintain the proper functioning of your pipes.
While chemical cleaners can be effective in dissolving fat, they come with risks. Caustic, oxidizing, and acid cleaners can corrode metal or plastic pipes, potentially leading to plumbing system failure. Enzymatic cleaners can also be used, but they work slowly, especially in cold conditions.
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Bleach is ineffective at dissolving fat
Instead, one method to dissolve fat in plastic pipes is to use hot water. By pouring boiling hot water down the pipes, the grease and fat will start to dissolve. However, this method also has its drawbacks. The hot water may simply move the fat further along the pipe, causing it to become lodged in a less accessible area. This could result in more difficult and costly repairs. Additionally, if you have UPVC pipes, hot water may soften the joints, leading to leaks. Therefore, while hot water can be effective in dissolving fat, it should be used with caution and may not be suitable for all types of pipes.
Another approach to dissolving fat in plastic pipes is to use commercial drain cleaners. These cleaners often contain caustic soda (sodium hydroxide) as their main ingredient, which can effectively break down fats. However, these chemical cleaners can also have negative effects on pipes, especially with regular use, and may contribute to corrosion. Therefore, while commercial drain cleaners can be effective in dissolving fat, they should be used sparingly and with caution.
To avoid the potential pitfalls of using hot water or chemical cleaners, preventative measures are key. It is important to avoid pouring oils, fats, or grease down the sink whenever possible. By changing the way we handle grease and maintaining our drains annually, we can significantly reduce the risk of blocked pipes. Additionally, ensuring that food particles, especially vegetable peels, do not end up in the disposal can help prevent the formation of paste that can line the pipes and contribute to blockages.
In conclusion, while bleach is ineffective at dissolving fat, there are alternative methods such as hot water and commercial drain cleaners. However, the best approach is to prevent blockages in the first place by properly disposing of grease and maintaining drains regularly.
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Chemical cleaners can damage pipes
Chemical drain cleaners are popular products for clogged pipes and drains. They are marketed as convenient and inexpensive options to treat plumbing systems. However, they can be extremely harmful to pipes, people, and the environment.
Chemical drain cleaners use a combination of harsh chemicals, which can easily burn through any blockades in the pipes. Even though they will free the pipe of potential clogs, the chemical reactions will also expose your pipes to heat and gas. This can be fatal to your pipes, especially if you have PVC soft pipes or old ones that are more susceptible to leaks. Old seals, chalking, and metal fittings can also begin to corrode if they face too much exposure to harsh chemicals.
The corrosive nature of chemical cleaners can damage certain types of plumbing, especially with repeated use. They can degrade PVC pipes and older metal piping and damage the seals and joints. Indications include leaks, weakened water flow, and visible pipe corrosion or deterioration. Older metal pipes, PVC pipes, and pipes already in a weakened condition are more susceptible to damage from harsh chemicals.
Chemical drain cleaners are also harmful to humans. These products contain toxic ingredients that can cause serious harm if inhaled, ingested, or if they come into contact with your skin. The fumes from chemical drain cleaners can irritate your nose, throat, and lungs, potentially triggering asthma or respiratory issues. Repeated use and prolonged exposure can lead to severe health complications. If accidentally splashed on the skin or in the eyes, chemical drain cleaners can cause chemical burns, severe irritation, or even blindness.
In addition to the health risks, chemical drain cleaners can also cause water contamination. When poured down the drain, these chemicals don't just disappear. They eventually make their way into local waterways, where they can exist for an extended time. Some compounds in caustic and oxidizing cleaners can take months or even years to fully degrade, continuing to harm aquatic ecosystems and affecting fish, plants, and other wildlife. Toxin accumulation in the tissues of aquatic organisms leads to higher concentrations in animals higher up the food chain, disrupting entire ecosystems.
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Enzymatic cleaners dissolve fat slowly
Enzymatic cleaners are biological compounds used to break down organic waste. They are cleaning products that use non-pathogenic, beneficial bacteria to digest wastes, soils, stains, and malodors. Enzymatic cleaners are also known as bio-enzymatic cleaners. They are created by bacteria to help break down large molecules. These bio-enzymatic cleaners contain various enzymes to break down different types of soils. For example, proteases break down protein-based molecules, lipases break down fat molecules, and amylases break down starch molecules.
Enzymatic cleaners are an effective way to remove bio-based stains like body soils, sweat, blood, pet messes, food, grass, and dirt. They are also safe and affordable. However, they take time to work and are most effective in warm, moist conditions.
When used correctly, enzymatic cleaners eliminate stains and odors by breaking down organic molecules. They are also gentle on fabrics, biodegradable, and generally safe to use in households with children and pets. Enzymatic cleaners are often safer for the environment and human health compared to other chemical products.
Enzymatic cleaners dissolve fats slowly, especially if it is cold. They can be used to clean pipes and drains blocked by grease and fat. However, it is important to note that enzymatic cleaners are not a quick fix and may take time to effectively dissolve the fat.
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Prevent fat build-up with a fat trap catcher
While chemical cleaners can be effective at dissolving fat in pipes, they can also corrode metal or plastic pipes, especially with regular use. This can cause your plumbing system to collapse, which is a far worse issue than blocked drains. Boiling water can also be used to dissolve fat, but it may simply move the fat further down the pipe, causing it to solidify and create a blockage. Additionally, pouring boiling water into UPVC pipes may melt and soften the joints, resulting in leaks.
To avoid these issues, it is important to prevent fat from building up in the first place. This can be done by using a fat trap catcher, also known as a passive grease trap or grease interceptor. Fat traps are stainless-steel boxes designed to capture fats, oils, and grease (FOG) before they flow down the drainage network. FOG is less dense than water and floats on top, allowing the grey water to flow through the outlet. Over time, the trapped FOG will build up, so the trap must be regularly maintained or serviced.
Fat traps play an important role in grease management, especially in commercial kitchens. Caterers who do not comply with FOG legislation, such as the Water Industry Act 1991 and 1999, may face large fines and even kitchen closure if FOG waste is not managed effectively. By installing a fat trap, caterers can also collect and resell the "yellow grease" to offset the costs of the trap.
In addition to fat traps, there are other grease management solutions available, such as grease recovery units (GRUs). GRUs are more efficient and have a longer life expectancy and lower running costs compared to traditional grease traps. However, they have a higher initial investment cost.
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Frequently asked questions
It is not recommended to use chemical cleaners on plastic pipes as they can corrode and damage them. Instead, try using a plunger to force air through the water and dislodge the clog.
Prevention is always better than cure, so it is recommended to avoid pouring vegetable oil, cooking grease, or any fatty liquids down the sink. You can also use a fat trap catcher in your kitchen and bathroom sinks to prevent larger solid items from creating clogs.
Boiling hot water can be used to dissolve fat in metal pipes. However, be cautious as the fat may simply move further along the pipe and solidify, causing a more difficult blockage to remove.
Organic solvents and enzymatic cleaners can be used to dissolve fat. Enzymatic cleaners work especially well in cold conditions.











































