Rain Harvesting Downpipe First Flush Diverters, such as the 90mm, 100mm and 150mm kits, are installed at each downpipe that supplies water to the tank.
Protect your rainwater quality by diverting the most contaminated water that washes off your roof with the first few millimetres of rainfall with a First Flush Downpipe Diverter.
First Flush diverters help you plan for volume by allowing you to choose your catchment volume with custom catchment size and/ or an advanced release valve.
First Flush Diverters help divert the first flush, through their design. They are installed using a T junction or high flow inlet to which the diversion chamber is fitted. As the chamber fills with the initial dirty water from your roof, a ball rises until it seals the inlet, allowing the rest of your rainwater, which is much cleaner, to flow directly to your tank.
*Please note we only stock the 90mm size WATDIV90 (WDDP01). All other variants will need to be ordered in from our supplier.
By diverting and discarding the most contaminated water from your roof, the First Flush Downpipe helps keep hazardous bacteria and fine particles out of your tank. This improves the quality of the rainwater you collect and is a key step in effective Rain Harvesting practices.
Supplied in a kit with T junction, ball and drip-drainer included, this first flush diverter can be installed on walls, posts, stands or even under your eaves. Simply add a customised length of pipe to divert your desired volume of dirty, contaminated water from each downpipe.
The first flush diverter’s slow release valves automatically drains the dirty water you capture so you can enjoy the benefits of first flush diversion again and again. The draining water can feed your garden irrigation system or be discarded into stormwater.
The length of pipe required to form your first flush diversion chamber will depend upon how much water you need to isolate and capture.
The following measurements are given as a guide only.
Size of Pipe | Required Isolation Capacity |
1 metre of 90mm | 5.7 litres |
1 metre of 100mm | 8.8 litres |
1 metre of 150mm | 18.8 litres |
1 metre of 225mm | 45 litres |
1 metre of 300mm | 72 litres |
Rain Harvesting Downpipe First Flush Diverters, such as the 90mm, 100mm and 150mm kits, are installed at each downpipe that supplies water to the tank.
Protect your rainwater quality by diverting the most contaminated water that washes off your roof with the first few millimetres of rainfall with a First Flush Downpipe Diverter.
First Flush diverters help you plan for volume by allowing you to choose your catchment volume with custom catchment size and/ or an advanced release valve.
First Flush Diverters help divert the first flush, through their design. They are installed using a T junction or high flow inlet to which the diversion chamber is fitted. As the chamber fills with the initial dirty water from your roof, a ball rises until it seals the inlet, allowing the rest of your rainwater, which is much cleaner, to flow directly to your tank.
*Please note we only stock the 90mm size WATDIV90 (WDDP01). All other variants will need to be ordered in from our supplier.
By diverting and discarding the most contaminated water from your roof, the First Flush Downpipe helps keep hazardous bacteria and fine particles out of your tank. This improves the quality of the rainwater you collect and is a key step in effective Rain Harvesting practices.
Supplied in a kit with T junction, ball and drip-drainer included, this first flush diverter can be installed on walls, posts, stands or even under your eaves. Simply add a customised length of pipe to divert your desired volume of dirty, contaminated water from each downpipe.
The first flush diverter’s slow release valves automatically drains the dirty water you capture so you can enjoy the benefits of first flush diversion again and again. The draining water can feed your garden irrigation system or be discarded into stormwater.
The length of pipe required to form your first flush diversion chamber will depend upon how much water you need to isolate and capture.
The following measurements are given as a guide only.
Size of Pipe | Required Isolation Capacity |
1 metre of 90mm | 5.7 litres |
1 metre of 100mm | 8.8 litres |
1 metre of 150mm | 18.8 litres |
1 metre of 225mm | 45 litres |
1 metre of 300mm | 72 litres |