Choosing A Rain Water Tank

Choosing a rain water tank or any other type of tank can be difficult as there are so many brands and types of storage tanks on the market; this article outlines some tips to take into account when choosing a rainwater tank. Some advantages of plastic or polyethylene water tanks is also discussed.

jojo rainwater tanks

What size water tank do I need?

The installation of a ‘large as possible’ rainwater tank and harvesting rainwater from your roof minimises the impact of water shortages and lessens your water costs.

  • Calculate your likely annual usage from the water storage requirement table below.
  • Using the water catchment table and the average rainfall for your area, calculate the amount of rainwater captured by your roof.
  • Now you can check your intended usage against the average annual catchment.
  • Identify your proposed water tank site and measure the space and height available.

Water Storage Requirements Table

The following tables displayed show estimated figures and should only be used as a guide.

Average Household Water Requirements

*Daily Use includes bath, toilet, cleaning teeth, etc.

Application 1 Person 2 People 4 People Usage X #Days Litres
*Daily Use 250L 360L 650L X
Washing Machine 120L 130L 150L X
Dishwasher 35L 35L 35L X




Average Garden Water Requirements Table

Application Garden Garden & Lawn Usage X #Days Litres
Small garden area 135L 355L X
Typical garden area 150L 495L X
Large garden area 165L 1125L X

jojo tenke

Advantages of using plastic or polyethylene water tanks over other materials:

  • Old concrete water tanks can get calcium leaching out of the walls, forming white deposits.
  • Tin and galvanised iron or steel water tanks can react chemically with the water, especially minerals in bore water.
  • Plastic lined corrugated iron  water tanks sweat between the liner and the corrugated iron causing rust. The liner will split and is not vermin proof.
  • Fibreglass water tanks break down after a period of time.
  • Open top water tanks or water tanks with shadecloth over the top allow dirt, debris and sunlight into them causing algae growth.

Source: Practical Plastics

We recommend JoJo tanks which are of one-piece construction (rotomoulded so no seams) and made from food grade polyethylene, suitable for storing water for human consumption. JoJo water tanks also have a black plastic inner liner that inhibits algae growth and keeps the store water fresher for longer. There are many JoJo tanks tanks that are suitable for rainwater harvesting, from the popular 750 litre Slimline tank right up to the 20000 litre vertical water tank; click on the links below for more information about JoJo Tanks products.

JoJo Tanks South Africa offer a wide range of products such as plastic water tanks and chemical tanks to suit every household, business or agricultural need, including silo tanks and silo tank stands as well as other high quality JoJo Tanks products.  See JoJo Tanks’ VERTICAL TANKS, HORIZONTAL TANKS (transporter tanks), STEEL TANK STANDS and OTHER JOJO PRODUCTS and see JoJo Tanks’ NEW 6000 LITRE UNDERGROUND TANKSAlso see our FAQ and WATER TANK PRICES.

JoJo’s superior polyethylene plastic water tanks and steel water tank stands make JoJo Tanks the leaders in plastic water tank technology and the quality, affordability and 8-year guarantee on these water tanks make JoJo products one of the best choices in South Africa.  *All JoJo Tanks polyethylene tanks and products now carry a 8 year warranty (on tanks purchased on or after 1 July 2013)*  JoJo’s water tanks and chemical tanks come standard with a number of features that are often lacking on cheaper/inferior plastic tanks made by other companies in South Africa.

We are authorised JoJo Tanks dealers in South Africa and dispatch orders directly from JoJo Tank depots to save on transport costs. Full range of JoJo Tanks products and JoJo water tanks for sale.  CONTACT US for a quote on the right JoJo water tank or other JoJo product for you.  Special discounts are available on multiple orders of chemical tanks and water tanks and to our commercial and government customers. We can usually delivery tanks and tank stands free of charge to business/commercial addresses in South Africa.


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