FEATURES 31
Africa Tanks
Installed domestic water tank .
When all this filtering and so on is done , the water can be used . Most often systems like these are used for irrigation and cleaning hard surfaces like paving . It can also be used to flush toilets . This water , however , cannot be connected to municipal water as back flow prevention may be below par and create a health risk . Importantly , while it is cleared of a great deal of debris , this water is not drinkable .
Van Zyl says , “ This harvested rainwater still contains contaminants , making it unsafe to consume – things like iron and rust , depending on the roof ’ s substrate . Bacteria , perhaps . Safety must always come first . You are required to put up warning stickers at every tap point to make people aware that the water is not drinkable . There is some pretty serious filtration systems available to treat that water so that it is drinkable .”
What do you do about the insects ? This is a big question , because we all know that standing water can easily become an ecosystem . Mosquitos are the first insects that come to mind , however there are many water creatures who would be very happy to set up home in or around your water storage tank .
Rainwater harvesting is a smart business move “ As plumbers , this should be added to your basket of offerings to consumers ,” says van Zyl .
Bowren stands firmly behind this idea . She says , “ It has always been our strong recommendation that customers engage qualified plumbers when installing their rainwater harvesting system . This ensures precise installation that aligns with the manufacturer ' s instructions and guidelines , to maintain compliance and potential of voiding warranties .”
A system that is correctly installed , with compliant products and the manufacturer ’ s input , will go a long way in ensuring the system ’ s longevity . It is an investment , after all .
Making stored water potable is not an impossible dream and will be covered in more detail in our March issue when we look at various water purification options . It involves a little more elbow grease and cost . And some pretty serious filtration .
A little cage called a mozzie screen , that catches insects , can be fitted to the bottom of inlet pipes on the tank . This is an excellent control to put into place to prevent water from being contaminated .
Don ’ t forget the gutters ! Gutters are often overlooked when it comes to rainwater harvesting . Ideally , these should be slightly angled to assist with waterflow . Water travels down the gutters and into the storage system , which means it is vital to keep the gutters clean to allow for free flow of water .
A clog of leaves can be a pain when it comes to rainwater harvesting , not just because it impedes the flow of water , but also because it can create a breeding ground for bacteria , fungi and other contaminants . The best course of action here is to ensure that gutters are regularly cleaned .
The material that makes up the guttering is also important . PVC guttering is recommended . Many metal gutters – and especially if they have been painted – pose hazards with paint and metals leaching into the water runoff .
Polyethylene storage tanks for water and chemicals In SANS 1731:2017 , paragraphs 4.10.1 and 4.10.2 address materials in contact with drinking water and food . Naturally , the material that the tanks are made out of matters . The materials that are used to make the tanks must not pose a toxic hazard , promote the growth of microbes , give the food or water an unpleasant taste or odour or discolour the food or water . Materials and chemicals should not leach into drinking water and food .
Be sure that all tanks installed meet the SANS 1731:2017 stipulations . PA
“ Making stored water potable is not an impossible dream and will be covered in more detail in our March issue when we look at various water purification options .”
January 2024 Volume 29 I Number 11 www . plumbingafrica . co . za