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Gurgling Drains

Gurgling Drains

Gurgling drains should never be ignored as they are your early warning that you are potentially about to experience blocked sewer drains.

what causes gurgling drains

Generally the sounds of gurgling drains will be coming from your toilet or from the bathroom floor waste drainage trap when you are using other plumbing fixtures. Very simply gurgling drains are similar to you experiencing an asthma attack because the drain is struggling to breath.

What has occurred in your underground sewer drains is that the drains are full of waste water that are blocking or partially blocking the drains vent pipe that connects from your drain and extends up above your roof.

Therefore when you use any of your plumbing because the vent is not letting the drain breath the drain creates a vacuum through a toilet pan or floor waste trap or occasionally a laundry tub in an attempt to get air. Normally only part of the water in the fixture trap is sucked out leaving the remainder of the water in the trap and it this water movement that causes the gurgling drains as air is sucked into the drain.

The interconnecting plumbing and sewer drainage system in your home is a very simple system but it must be able to breath and get air into the system through your vent pipes. Many people believe that the vent pipe is a stink pipe to remove smelly sewer odours from the sewer drain. This is partially correct but the vent pipes other job is to equalise air pressures within your sewer drains and give you a balanced system that allows waste water to flow.

Very simply whenever you flush the toilet or have a shower or turn your washing machine on the waste water immediately runs into your sewer drains. Instantly in the drain you get water and air displacement with a vacuum being created behind the flowing water that sucks air into the drain to equalise the pressure in your drain and allows the water to flow.

Gurgling drains should never ever be ignored as they seldom go away and should be investigated immediately.

By Gary Mays

Why Are Drain Flies Coming Out Of Bathroom Drains?

Why Are Drain Flies Coming Out Of Bathroom Drains?

At Whywait Plumbing we have had a number of calls from clients who are concerned they are about to be overrun by small drain flies in their bathroom. Generally the concern is that they are in large numbers and no matter what is done to kill them there is always more the next day.

Cleaning Your Drains Doesn’t Get Rid Of Drain Flies!

Many Whywait Plumbing clients had cleaned the bathroom until it could be cleaned no more. So by a process of elimination, they had decided that they were coming out of one of the drains in the bathroom. Frustratingly no matter how often some clients sat and observed the drains they never saw any of the drain flies emerging from the drain in the shower or basin or the floor waste.

What most people observed was the drain flies flying were mainly sitting on the walls or ceiling in the bathroom. Whywait Plumbing can confirm that what everyone had was what is commonly known as drain flies or bathroom flies.

What Do Drain Flies Look Like

what do drain flies look like

A typical looking drain fly on a bathroom wall

Drain flies are dark grey flies and are 2mm – 4mm in length with hairy moth-like wings. They have a jerky flight as they are poor fliers and usually are found close to the floor waste drain or area of origin. This is why they seldom stray outside the bathroom. In most cases, they are breeding in the bathroom floor waste trap.

Drain flies do not bite and are not known to transmit disease of any sort nor do they damage clothes or linen and are considered to more of a nuisance value in a home.

The adult drain flies and larvae can be controlled by eliminating or reducing breeding sites. If the infestation is minor the pouring of bleach into the floor trap will usually work in killing them. However, if that does not solve the problem then you will need to kill them by thoroughly cleaning the drain lines and or sealing of the floor trap.

The reason that they continually seem to be in large numbers despite constantly killing them is that eggs hatch in 32 to 48 hours when the temperature is above 20 degrees. The larvae mature in 9 -12 days and feed on the decaying organic matter that accumulates in the floor waste trap. The life cycle of drain flies is 1-3 weeks. Adults drain flies live about 2 weeks, with old ones dying and new ones emerging. They feed on the wastewater in the floor waste trap. During the day the adults rest in shaded areas such as under the basin or on walls near plumbing fixtures and on the sides of showers and baths. Most activity occurs during the evening when the flies are seen hovering about.

Septic Tanks Breeders

If you are on acreage and have septic tanks they may breed in large numbers and they may be carried by prevailing wind to nearby homes up to 3 kilometres away. Adult drain flies are small enough to pass through ordinary window mesh screens.

Thorough Cleaning of Drain and Traps

It is the experience of Whywait Plumbing that cleaning of the drains from the basin, shower and bath that discharge into the floor trap is only part of the answer. It is also beneficial to clean the floor trap thoroughly and pour bleach down the drain although this is washed away with each use of any of the fixtures.

DrainPro – The Drain Fly Solution

Gary Mays from Whywait Plumbing has gone through this entire experience at his own home in the ensuite bathroom. Gary Mays also installed a DrainPro unit into the floor waste which prevents not only drain flies but also bacteria, odours and insects from exiting through the drain into the bathroom.

It is 3 years since he installed DrainPro units in all of all bathroom floor traps and they have completely eliminated the annoying tiny flies.

New Toilets Reduce Water Flushing, But What Will Happen to The Drains

Traditionally toilets flushed 11 litres or 3 gallons of water every time they were flushed with the water all flowing along through a drainage system that was designed for large flows of water. Unless a drain was broken or roots entered the drain it was not common for a drain to block. That was of course until the advent of reduced flow dual flush toilets.

Now that toilet only flushes 4.5 litres of water on a full flush and 3 litres of water on a half flush into the drainage system. Coupled with reduced flows from every other tap this has produced a situation where drains designed for large flows of water have had the water flow reduced by 60% in most cases.

The increase in blocked drains due to the reduced water flows has been a big boost for plumbing companies such as Whywait Plumbing with drains clogging up for no other reason than lack of water flow. Often there is a dual problem of incorrect fall on the drain which creates high spots in the pipe leading to the drain becoming clogged at that point.

In Singapore scientists at Nanyang Technological University (NTU) have invented a new toilet system that will reduce the amount of water needed for flushing by up to 90 per cent compared to current toilet systems. Dubbed the No-Mix Vacuum Toilet, it has two chambers that separate the liquid and solid wastes. Using vacuum suction technology, similar to those used in aircraft toilets it uses 0.2 litres of water for urine and 1.0 litres of water for solids.

The No-Mix Vacuum Toilet installed in a standard public toilet which is flushed 100 times a day, is expected to save 160000 litres of water a year. The NTU scientists are now looking to carry out trials by installing the toilet prototypes in two NTU public toilet facilities. This trial is important due to the issues that plumbers are already aware of with the drains blocking at 4.5/3 litre flushes so a 1.0/0.2 litre flush is expected to exacerbate this problem in existing buildings.

The No-Mix Vacuum Toilet with it’s two chambers that separate the liquid and solid wastes also will turn human waste into electricity and fertilisers. The No-Mix Vacuum Toilet will divert the liquid waste to a processing facility where components used for fertilisers such as nitrogen, phosphorus and potassium can be recovered.  At the same time, the solid waste will be sent to a bioreactor where it will be digested to release bio-gas which contains methane. Methane is odourless and can be used to replace natural gas used in stoves for cooking. Methane can also be converted to electricity if used to fuel power plants or fuel cells.  ‘Grey water’ (used water from the laundry, shower and kitchen sink) can be released back into the drainage systems without further need for complex waste water treatment, while leftover food wastes can be sent either to the bioreactors or turned into compost and mixed with soil, resulting in a complete recovery of resources.

The No-Mix Vacuum Toilet uses will be limited in traditional buildings but will be useful for eco resorts, new housing estates, hotels, resorts, and especially communities not linked to the main sewerage system or unable to be connected and so require their own sewerage facilities.

Associate Professor Wang Jing-Yuan, Director of the Residues and Resource Reclamation Centre (R3C) at NTU who is leading the research project, said that their ultimate aim is not only for the new toilet system to save water, but to have a complete recovery of resources so that none will be wasted in resource-scarce Singapore.  “Having the human waste separated at source and processed on-site would lower costs needed in recovering resources, as treating mixed waste is energy intensive and not cost-effective,” Prof Wang said. “With our innovative toilet system, we can use simpler and cheaper methods of harvesting the useful chemicals and even produce fuel and energy from waste.”

The development of a No-Mix Vacuum Toilet has great potential for use on the Gold Coast in the development of tourist facilities in environmentally sensative areas where traditional sewerage systems cannot be installed.

Toilet Paper Is Blocking Your Drains

Toilet paper is blocking your drains and we know it for a fact at Whywait Plumbing. Blocked drain incidences have been increasing every year since 2005.

Whywait Plumbing have noted the upward trend of annual increases in the amount of blocked drains occurrences that require clearing with high-pressure water jetting equipment since 2005, with even sharper increases since 2008.

This has generally been attributed to the advent of low flow dual flush toilets especially the 4.5/3 litre toilet suites.

Your house drain that connects to the sewer was designed when water flows were much more substantial than they are now. Traditionally a toilet flush was 11 litres and this flow was supplemented by inflows from the bathroom, kitchen and laundry. Prior to legislative changes in 2007 a shower deluged you with a flow of 25 litres per minute now that is 9 litres. Taps in the remainder of the house all had substantial flow rates of 20 – 25 litres per minute but now that is 6 litres per minute.

Consequently, it made sense that the 70% reduction in water flows was the cause of this rapid increase in blocked drains. Naturally, this made complete sense in homes and business premises that were new or had upgraded their taps and toilets. But why were we seeing an increase where no such upgrades had occurred. Over the last year, Whywait Plumbing Services like many other plumbing companies began noticing when undertaking a CCTV survey of a drain, large clumps of toilet paper that had not broken down in the water.

This issue with toilet paper has now reached a point where the National Plumbing Regulators have had a NATA laboratory undertaking research on the varying degrees of toilet paper quality and its influence on flow performance down a drain. Results to date are concerning as over 20 commercially available toilet paper brands were evaluated in full performance testing. There were an excessive number of these toilet papers whose performance in poor break down in water can potentially cause more blockages than others.

It’s interesting to note that none of the toilet paper culprits that have an increased potential to cause blockages are locally manufactured. Its even more interesting that the Federal Government has a committee investigating the dumping of commodities by China into Australia and one of these commodities is toilet paper. It is doubtful whether Coles and Woolworths are too concerned about what happens to this cheap toilet they import once its passed through their checkouts. Who knows what these toilet papers are really manufactured from?


These cheap toilet papers are dominant in commercial buildings where contract cleaning companies install the cheapest toilet paper they can purchase. This has resulted in alarming increases in blockages in commercial buildings.

So next time when you pick up that packet of toilet paper that is on special in the supermarket just have a look to see where it is manufactured or you may unknowingly be purchasing a blocked drain at the same time.

By Gary Mays

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