Rainwater harvesting installation

Pre-installation:

Choose a tank

How to calculate what size tank would be sufficient for Rainwater Harvesting:

Roof p/m²

Tank Size

50 – 100

750 L – 2200 L

200 – 400

2500 L – 10 000 L

The biggest downfall of Rainwater Harvesting is lack of storage capacity.

Tank placement

Should preferably be at a downpipe, or alternatively be repositioned by use of proper piping/guttering.

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 concrete plinth needs to be built. Ideally the plinth should be covered by a concrete topping at least 85mm thick.

Recommended base sizes are as follows:

Tank

Diameter

Tank

Diameter

750L

860mm

2500L

1520mm

1500L

1510mm

5000L

1920mm

2200L

1520mm

10 000L

2300mm

 

 

1. Base / concrete plinth

Ensure tank is installed on a 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

Select desired pre-filtration options.
Pre-filtration will differ depending on preference and what the water will be used for.

 

3. Tank screen and leaf eater

a. Ensure 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

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

 

5. Cut a hole in the tank lid

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

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