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All other variants will need to be ordered in from our supplier.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eRain Harvesting Downpipe First Flush Diverters\u003c\/strong\u003e, such as the 90mm, 100mm and 150mm kits, are installed at each downpipe that supplies water to the tank. They utilise a dependable ball and seat system – a simple automatic system that does not  rely on mechanical parts or manual intervention.\u003c\/p\u003e\n\u003cp\u003eAs the water level rises in the diverter chamber, the ball floats, and once the chamber is full, the ball rests on a seat inside the diverter chamber preventing any further water entering the diverter. The subsequent flow of water is then automatically directed along the pipe system to the tank.\u003c\/p\u003e\n\u003ch4\u003eFEATURES:\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003ePrevents sediment, bird droppings, spiders, insects, mosquito eggs and debris from entering the rainwater tank.\u003c\/li\u003e\n\u003cli\u003eImproves water quality, protects pumps and internal appliances.\u003c\/li\u003e\n\u003cli\u003eIdeal to use in conjunction with a rain head.\u003c\/li\u003e\n\u003cli\u003eEasy installation, just add pipe and glue.\u003c\/li\u003e\n\u003cli\u003eNo mechanical parts.\u003c\/li\u003e\n\u003cli\u003eLow maintenance requirements\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cul\u003e\u003c\/ul\u003e"}

*Please note we only stock the 90mm size WATDIV90 (WDDP01). All other variants will need to be ordered in from our supplier.

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.

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.

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.

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.

  • Minimise the fine and dissolved organic and inorganic particles entering your tank
  • Reduce sediment build-up in your tank and sediment load on your post-tank pumps and filtration systems
  • Protect household fixtures and appliances (ie. washing machines, toilet cisterns, etc.) by lowering sediment and tannin deposits
  • Reduce nutrient load in your tank to limit anaerobic fermentation and algae growth
  • Diversion volume easily custom built through use of standard pipes.
  • Automatic reset valve drains after rainfall events
  • Comes in kit form

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

 

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