Water Storage Solutions: Rainwater Harvesting Above Ground

Provides an independent supply of rainwater ideal for non-potable uses.

Rainwater Harvesting Above Ground

JoJo’s Rainwater Harvesting Solution consists of a tank that accumulates water whenever it rains. It requires the installation of a pre-filtration solution, as well as suitable guttering and piping to transport the rainwater to the tank. Simple to install, its advantages include self-sufficiency and the convenience of not being dependent on regulated water resources.

Rainwater Harvesting Benefits

  • Free & unlimited water supply
  • Saves water
  • Reduces water bills
  • Access to adequate water supply when needed
  • Water fit for low-grade uses
  • Water can be consumed if properly filtered
Rainwater Harvesting Benefits

System Components

System Components

1. Tank

2. Base/Plinth

3. Pre-filtration

There are three pre-filtration options which will improve the quality of the water entering into the tank:
3a. Mesh/Tank Screen – beneath the lid
3b. Rainhead i.e. Leaf Eater
3c. First Flush Diverter

4. Pipes – 3 x 110 mm SV pipes

Lengths will vary depending on installation.
4a. From bottom of T-junction to slow release control valve (included in the First Flush Diverter).
4b. From side of T-junction to the elbow.
4c. From elbow through lid into the tank.

5. Elbow - 110mm

6. Tap - 20mm

To be purchased separately from dealer. An additional 40/20 reducer is then required to fit the tap onto the tank.


This is an example of a basic Rainwater Harvesting System. Each installation will vary based on the setup and your personal preferences.


Although rainwater systems are relatively maintenance-free, there are certain things that you should regularly undertake in order to prolong your system’s life, reduce the potential for damages and ensure you enjoy maximum benefits.

1. Rooftops

Rooftops should be cleaned regularly to avoid contamination of the runoff. Dust, leaves, animal excrement and dead insects accumulate on the roof during dry weather. It is therefore important to ensure that the roof is cleaned before the rainy season starts, followed by a monthly check to keep it clean.

2. Overhanging branches

See to it that branches overhanging the roof are regularly trimmed back.

3. Gutters

Ensure that gutters are free from leaves. It is a good idea to consider installing gutter mesh.

4. Pre-filtration

Regularly check the pre-filtration device(s) to ensure that it is free from leaves and that rainwater is able pass through.

5. First Flush Diverter

If a First Flush Diverter is installed, check and clean it out on a monthly basis. Ensure that the diverter is dripping out sufficiently in order to reset the system.

6. Keeping your tank clean

Inspect the inside of your tank every 3 months to make sure that leaf litter has not built up at the bottom of the tank. A properly designed system should not allow leaves and other material to enter the tank.

7. Water Quality

Remember that water collected from your roof will not be clean. If you intend to use the rainwater for drinking purposes, consult an installer with experience in installing water filtration systems. For irrigation purposes, however, this water is ideal.


Installation Guide

1. Pre installation

A. Choose a tank

Calculate which size tank you require for rainwater harvesting.

Note: The biggest downfall of rainwater harvesting is lack of storage capacity.

50 - 100750lt - 2200lt
200 - 4002500lt - 10 000lt

B. Tank placement

Tank should preferably be placed at a downpipe, or alternatively be repositioned through the use of proper piping/guttering.

C. Base/foundation

Tanks must be installed on a sound, level and smooth surface. Level paving will suffice, or a properly designed tank stand. Alternatively, a plinth needs to be built, ideally with a concrete surface bed at least 85mm thick.

D. Recommended Base Sizes

It is recommended that the foundation should be at least 100mm wider than diameter of tank.

750lt Slimline760mm860mm
1000lt Slimline 840mm 940mm
10 000lt 2200mm2300mm

2. Installation

1. Base/concrete plinth

1. Base/concrete plinth

Ensure that the tank is installed on suitable base. The base must be sound, level, smooth, free of any protrusions and at least 100mm wider than the base of the tank (refer to pre-installation).

2. Select pre-filtration

2. Select pre-filtration

Select desired pre-filtration options. Pre-filtration will differ depending on your preference and the intended use of the water.

3. Tank Screen/Leaf Eater

3. Tank Screen/Leaf Eater

a. Ensure that the Tank Screen is fitted beneath the lid of the tank.

b. Fit the leaf eater to the downpipe (vertically or horizontally).

4. First Flush Diverter

4. First Flush Diverter

Install the First Flush Diverter as per instructions provided inside the packaging. Note: the first flush utilises a dependable ball & seal system, requiring no manual intervention.

5. Cut a hole into the lid of the tank

5. Cut a hole into the lid of the tank

Cut a hole of 110.5mm in the middle of the lid and fit the pipe through the hole, stopping before the mesh/tank screen.

6. Recommendation

6. Recommendation

Install an additional elbow and pipe to the overflow, then route to a suitable desired area to ensure no water goes to waste.

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Install a JoJo Tank

Whether you’re looking for an installer or prefer the DIY-route, we’ve got all the information you need.

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Why JoJo?

10 Year Warranty

Tank Benefits

When you purchase a JoJo tank, you invest in a high-quality product from South Africa’s leading manufacturer of polyethylene tank solutions.

Our products offer the following benefits:

  • All JoJo polyethylene products come with a 10-year guarantee (extended from an 8-year guarantee as of 1 September 2017).
  • Tanks are available in different formats, with a variety of fittings and accessories to extend performance capabilities and versatility.
  • Products are manufactured with the best food-grade, quality virgin LLDPE.
  • With a UV-stabilised outer layer, our products are designed to withstand the harsh African climate.
  • The food-grade, black inner lining in our water tanks prevents algae growth and keeps water fresher for longer.
  • A stringent quality-control system ensures that products meet specified design standards.
  • All JoJo Water and Chemical Tanks are manufactured in accordance with the specifications outlined in SANS 1731:2017*
  • All Vertical, Horizontal and Septic Tanks carry a quality certification from the Agrément Board of South Africa.

Find more information on our compliance to Industry Tank Standards here.



How can we help you?

Find the answers to your most Frequently Asked Questions.

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From filters to tanks, JoJo offers a wide range of solutions to suite various applications including domestic, agricultural, industrial and commercial.

Having trouble finding the ideal solution for you? Have a look at what we have available and don’t hesitate to ask for assistance should you need any guidance.


Find installation guides, brochures & specification sheets, our 10-year warranty and other important documents here.

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For enquiries contact 011 695 8300 or email productinfo@jojotanks.co.za