Under Water Restrictions?

Here is the low down on Grey, Rain and Pool water recycling systems. It costs less than you think.

The recent drought across the country has prompted homeowners to consider recycling water for reuse. It is estimated that up to 50% of domestic water use does not need to be of a potable quality (drinkable). There are three primary options;

  • Grey water recycling within domestic homes in the process of taking used water from baths, washing machine, showers and bathroom basins, filtering it and then storing it for re-use. It does not include any wastewater that comes into contact with food.
  • Rainwater harvesting systems substantially reduce consumption of potable water by storing water collected from rainfall, using the roof as the collector system.

In both rain and greywater systems, the harvested water can be used for flushing toilets, watering gardens, topping up the pool and general cleaning.

  • Pool water recycling involves storing backwash water for top-up purposes.

Here is a breakdown of the three water conservation systems installed at homes plus their average cost. Please note that price ranges submitted exclude VAT and are based on industry average pricing which includes installation:

Grey water recycling:

  • Entry level 50 Litre system. This system will recycle grey water from baths, showers, hand wash basins and clothes washing machine for irrigation. It’s a hands-on system and cannot be connected to your irrigation system. It typically comes with a 30m long high-pressure hose and sprinkler. You have to move the hose around daily and the system needs weekly cleaning. It can be installed anywhere; in a walkway, driveway, flower bed, wherever – it depends on your house design.
  • Entry level systems with outlets close to one another with not too much paving between outlets, one hose and sprinkler – approx. R 17 500 Price goes up if you add multiple outlets.
  • For a bigger greywater recycling system for irrigation that has larger storage capacity (500 to 1000 litres) and is connected to your irrigation system prices ranges between R 60 000 – R 80 000. The size of storage tank determines the volume of grey water that will be recycled.
  • For a more advanced system that can reticulate grey water back into the house for toilet flushing and laundry washing, in addition to garden irrigation, costs vary from R90 000 to R12000.00
  • The recycling of grey water through a wetlands system. Prices vary depending on the amount of grey water generated and property/wetlands size.  R 40 000+

Rainwater Harvesting

  • Two 750L rainwater harvesting system is your basic entry level system with downpipe e fitted directly into the tank from the roof will cost R8000.00. Downpipe fitted with a rain filter etc. @ approx. R10 000. Two x 750L interlinked to increase the storage capacity to 1500L installed with a submersible pump, rain filter etc @ approx. R 18000.00. Please note that with these systems, you bucket to water your garden manually.
  • For the larger 2 500L tank installed right next to the house with a small submersible pump – gotta love the submersible pumps for aesthetics and security reasons, expect to pay R 14 000. It’s simple and straightforward – you connect a hose or sprinkler to the tank and hey presto! To extend the system for either toilet flushing for clothes washing machine (one application per tank), the price goes up to R 22 500. You’ll be surprised how much water you’ll save …and money.
  • A bigger tank 5 000L installed anywhere in the garden, harvesting from one side of the house (two or three downpipes), also installed with a submersible pump (can be bigger) for approx. R 26 000. Note – big tanks can be an eyesore.
  • For the biggest system harvesting from you’re the roof, install two or three 5000L tanks (depending on the size of the roof) and link the harvested water to your irrigation system expect to pay between R 50 000 – R 75 000. It really depends on many factors… Stormwater runoff can also be harvested and used for this application.
  • For a complete off the main water supply system is the best way to go but it is also the most expensive. Water harvesting is done directly from the roof, tanks installed anywhere for water use inside and outside the house. The water is connected to your municipal supply which means during the rainy season you will use rainwater and during the dry winter season you will switch over to municipal water. The system is designed in such a way that you will always have backup water for those water outage days, winter or summer. Prices range from R60 000 for a 5000L tank system to R120 000 for a 15000L system

Pool Water Harvesting 

  • This is a use even less incentive to add to either a rain or grey water system. The recycling of backwashed pool water for topping up purposes again starts at around R8000 for a 750L tank.

So there you go, recycling your own wastewater is not that expensive and will ensure that when the taps run dry, you have stored water to continue a comfortable home living experience. It is important to size a system according to your household needs. If you don’t have the budget, start small and grow your system in time. Water recycling systems are not about the payback period. It is about being environmentally friendly and ensuring your household has water when the taps run dry.

The Building Whisperer

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Green Building Africa promotes the need for net carbon zero buildings and cities in Africa. We are fiercely independent and encourage outlying thinkers to contribute to the #netcarbonzero movement. Climate change is upon us and now is the time to react in a more diverse and broader approach to sustainability in the built environment. We challenge architects, property developers, urban planners, renewable energy professionals and green building specialists. We also challenge the funding houses and regulators and the role they play in facilitating investment into green projects. Lastly, we explore and investigate new technology and real-time data to speed up the journey in realising a net carbon zero environment for our children.

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