RotoTank for Greywater Harvesting

Grey Water Harvesting

With water shortages worldwide because of increased industrialization and Global Warming, we are all looking into water-saving alternatives. For this reason, governments and other stakeholders are working on innovative ways of preserving water resources. Grey Water Harvesting has become a reality for Capetonians as we struggle to avoid DAY ZERO. Never in known history has the drought-ravaged Western Cape been this close to day zero.

Recycling water has developed in many aspects, including greywater production. Greywater is one means the South African government recommends creating massive water savings among homes. This innovation, a natural partner, has come when it is in dire need.

In Cape Town, water is an issue with the growing population and limited water resources.

Therefore, one of the most effective ways of water management is the adoption of Greywater. Greywater harvesting is the better option that saves the planet’s most valuable resource, water.

Everyone is now conscious of every drop of water that is lost. Due to global warming, climate change has made massive changes in weather patterns affecting rain and heat. Due to global warming, climate change has greatly changed weather patterns affecting rain and heat.

greywater recycling to save water
greywater recycling to save water

What is Black Water?

We generate Blackwater from places such as toilets, dishwashers, etc. It is very difficult to recycle due to the high level of contamination. Importantly we must not water flowers and veggies with Blackwater.

What is Grey Water?

Grey Water Harvesting is any domestic water viewed as waste in one aspect while it is most useful. Greywater is water from the bath, shower or basin. Water is used for home purposes like showers, washing machines, and tubs. In general, bathwater or shower water is ideal to use as Greywater. Also, water from the washing machine is a great source of Greywater. In general, bathwater or shower water is perfect to use as Greywater. Also, water from the washing machine is a great source of Greywater. We can recycle 50% of household water.

Most people have woken up to the advantages Grey Water Harvesting brings along. Sewage is generally termed Blackwater and has an organic residue at a higher capacity. Kitchen water is black water containing some organic loading.

Greywater Recycling For The Garden

Although we view Greywater as dirty water, it is safe when seen from an irrigation angle.

When Grey Water is left to stream into the rivers, lakes or estuaries as effluent, it becomes a pollutant. The constituents in the water can make the water hazardous. On the other hand, when diverted to the plants, these constituents become useful organic fertilizers.

The easiest means to use Greywater involves piping it directly outside and watering the intended plants and fruit trees. We can use Greywater canto water vegetables.

A greywater system requires using “plant-friendly” products devoid of excessive salts and chemicals like boron and chlorine. The buildup of these chemicals (salts and boron) in the soil may harm plants.

The presence of fat content in the kitchen water is a further damaging factor to plants.

It is tapping the already-used water into a more useful form. Unlike the harvested water from other sources like rainwater, Greywater is obtained from sources that have already used the water.

These sources might include water from sinks, bathwater, ponds, pool backwash or even rinse water. In some cases, it is harvested to be used for toilet flushing. When the water is purified, its use can be upgraded for the irrigation field and other applications.

Grey Water Harvesting is a relatively new practice in institutional buildings. This practice calls for many regulatory implications instead of rainwater harvesting. Grey Water contains chemical and biological contaminants, unlike other renewable water sources. These contaminants may contaminate the water into black water, leading to an awful smell and a health hazard if maltreated.


Greywater harvesting saves water
Greywater harvesting saves water

Types Of Water Tanks For Greywater Harvesting

There are many types of water tanks for Greywater Harvesting water tanks. Please note they are not all the same. If you want years of service may choose RotoTank. They have a fantastic guarantee, and they make a good product.

Jojo Water tank
Jojo Water tank
Atlas Water Tanks for water storage
Atlas Water Tanks for water storage
Double Volume Water Tanks for extra storage
Double Volume Water Tanks for extra storage
RotoTank the 10 year guarantee
RotoTank the ten year guarantee


Advantages Associated With Grey Water Harvesting

There are many benefits associated with the use of Greywater. Embracing the greywater system attracts the following pros.
It is Economical:
If your household bears a water meter, your reduction in water usage translates to a reduction in the bill. The good news is that a greywater system’s purchase and installation costs are nearly nil. It does not require a huge initial investment.

After the purchase and installation of the system, you are bound to have other benefits flowing in. Although it depends on how much water you use or the frequency of use, water usage is considerably reduced when the Grey Water system is imposed.

Once your water tanks are full, the garden or lawn can be sprayed with free water.

Natural resource protection

There is a significant growth in population across the globe. This is not without the southern African part. The ever-rising population and industrial growth rates also cause strain on our water resources. Therefore, everyone has a role to play in shunning the epidemic.

Each can cultivate a sustainable relationship with our environment. This can only be possible if we economize on the use of water. Grey Water usage is a brilliant way to ensure that the generation won’t lament the water issue.

Reduce sewage

Not only does the grey water reduce the demand for water supply, but also in septic wastage. Reusing the water leaves less inflow into sewage as septic flow. You cut the load in the septic wastewater. The reduction translates to the septic system handling less of the effluent.

There are minimal chances of servicing the sewage. Therefore, the system will be able to handle less waste and extend shelf life. Additionally, you will be charged fewer coins as you reduce the sewage amounts. Therefore, by lowering the disposable water flow, you will have more savings in your pocket.

Save water with Greywater recycling
Save water with Greywater recycling

Grey Water Harvesting Solves soil problems.

Any garden will require the appropriate amounts of sunlight, soil and adequate water to bear fruits successfully. According to soil science, different plants will thrive in their various environments.

A garden must grow in its most natural setting to bring forth the best. As plants require these conditions during their growth, dry soils crave more water.

An alternative to sprinkler systems is the Grey Water Harvesting system. Since they are equipped with a sieving system, the household water flows through the pipes into the gardens to wet the thirsty soils. Water offers a variety of benefits to the plant, from the plant’s health to water conservation.

Little usage of water

The undeniable benefit of Greywater is the economical use of water. An average household is estimated to use between 300 and 400 litres of recyclable water daily. Also, an average suburban garden uses about 35% of domestic water daily from Greywater. The level can rise to 60% if one does the recycling. Grey Water saves water usage in an era when water resources are scarce.

Enhances More Savings With Grey Water Harvesting

The savings generated when the use of Greywater is imposed get higher. Finances for pure sourcing water for irrigation are lessened in the overall process.

Reusing the Greywater keeps it out of the septic system. As a result, the chances of polluting water bodies become narrow. The finances that could have been used to treat the polluted water are also saved.

Reusing Grey Water for irrigation reconnects urban inhabitants and the garden fields to the natural water cycle. Reusing Grey Water results in a dramatic drop in the demand for freshwater. This as well contributes to savings.

Nutritional Benefits to Plants

The soap residues can provide sulfates and nitrates, components of garden fertilizers. Researchers say these compounds are more beneficial to the garden than tap water. We can use Greywater in vegetable gardens.

However, using the water two weeks before harvesting is not recommended. It is satisfying to realize that plants are fed with nutrients that eventually benefits human. These nutrients become crucial when more food is needed in a drought, at such a time like this. Greywater aids vegetation to flourish in the event when freshwater may not be available.

Process of Grey Water Harvesting

Harvesting of Grey Water is a simple process when broken down into stages. It entails both biological and chemical processes. The process has several systems that are synchronized into one operation. The following methods comply with each other to bring the overall result.
Water from showers and sinks is collected via a plumbing system. The piping system is separate from the one that connects the toilets. The collected water is then diverted to a collecting tank. Through filtration, some large particles are eliminated.

Chlorine and other oxidizing agents are added to the tank’s water. These chemicals are geared towards lessening the level of bacteria in the water.

After a given period, the Greywater is diverted through a pumping system to a filtration skid. Larger particulates are eliminated here. If commercial systems are the ones to be used, a self-cleaning disk filter serves the purpose.

The preceding stage makes use of a multimedia filter that removes smaller particles. The system is adjusted with filters that minimize maintenance. This is done through an automatic backwash step.

All the debris gets instant flushing ending up in a sewer system. The backwash also rearranges the multi-levels of filtration media.

The last step is the “polishing” stage. The activated charcoal makes the water clear, devoid of any impeding odour. The treated Grey Water is now ready for reuse.


To keep off organisms like bacteria, algae, viruses, and other contaminants, it is necessary to sterilize the water in the tank. This is made possible through chlorination and the use of the UV sanitation method. There is a possibility of contaminants remaining in the water despite the abovementioned process.

Therefore, chlorination is done to maintain the entire system clean. The addition of chlorine chemicals is the most effective method to achieve this.
Ultraviolet sanitation exposes the water to a given wavelength of UV light. The light obliterates the organism’s DNA. An expert is needed to maintain specific and sufficient radiation. Some Grey Water Harvesting systems use UV sterilizers to achieve this purpose.

It is an advantageous method that uses zero chemicals to render the organisms sterile. It is a less expensive method as compared to other methods.


Great water storage is necessary, especially when the demand for water shoots high. The space availability also determines the volume of Grey Water treated and turnover frequency.

It is necessary to have the tanks pre-mounted on a higher level, slightly above the ground level. Storage enhances the efficient supply of water throughout the garden in irrigation.

Enough storage is necessary for the dry spell, especially when rains become irregular. The storage will be useful, especially when facing a severe drought. Many tanks are on the market from JOJO tanks and a few other suppliers. Our advice is to look around for competitive pricing on the water tanks.

Application of Greywater

A depressurization system is required for a greywater system to move, which moves the Greywater to the restrooms and other areas within the building. Low-cost pumps are also available to move the water from the tanks to the required areas in the home or garden.

A commercial system involves the use of pump skids that are duplex. The system has two commercial-grade pump twins that operate in tandem. Each pump is designed to work at a rate of 70% of peak demand.

In the event of high demand, the system works alternately. When the demand does not want, the two identical pumps alternate in operation.

Future of Greywater

Nothing is more useful among all living things than freshwater. Unfortunately, it is becoming a limited resource. It is estimated that global fresh, natural water is subject to lower Research conducted by Scientific American Magazine. The ever-growing population in an equal climate change will create more water scarcity.

The developing countries are not exempt from the estimated far and wide scarcities. The rapid growth of the population will demand more food supply. The food supply is highly dependent on water. Human needs water the more. To offset the shortage of food supply, there will be a need for the rapid growth of the water-intensive agricultural system.

These systems will call for more water to continue supporting the sector. Therefore, Greywater will be a need that will require constant supply in the future.

The takeaway

The use of Grey Water Harvesting has become popular. It comes as a remedy to the economic system and natural environment conservation.

The technological means of installing the system are not complex either. A rapidly growing city like Cape Town is a critical system to sort out water issues and drought endemics. The future of Greywater can be viewed in a broader funnel end.

It is a means that will eliminate some problems associated with the food shortage and the natural ecosystem.

With water being a scarce resource globally, Grey Water Harvesting is an excellent way to use water economically. It is a perfect way for anyone looking forward to moderating their footprint. This system will help the earth, your household and your wallet concurrently. Never use Grey Water for a potable purpose like cooking or drinking unless thoroughly purified.