First Flush diverter- Instant Solutions

What is first flush diverter device?

The first flush method, also known as a diversion system or diversion valve, redirects water contaminated from a surface, such as a wash-down area that is not roofed, to a different discharge source.

The initial rain run across a roof removes the roof of dirt, oil and other pollutants. Typically, when 10 mm of rainfall falls onto an unclean surface, the surface is considered to be “flushed”.

The water taken off of a roof must be treated before it is allowed to re-enter storm water systems.

First flush water diverters enhance the quality of water and decrease tank maintenance by stopping the initial stream of water, which could be contaminated by roof sludge and other contaminants, from getting into the tank. In addition, they make sure that clean water is accessible to use and protect rainwater pumps as well as internal appliances used in the home, such as toilets, washing machines for clothes, hot water systems etc.

First-flush diverters must operate in a way that is automatic and not rely on valves operated manually or other devices. The diverted rainwater is not to be discharged onto the roof surface, and it must flow in a way that is in line with storm water runoff rules of the area of jurisdiction. First-flush diverters must be supplied with access to maintenance and maintenance.

first flush diverter

Reuse diverted rainwater

First, flush systems for diversion from Clean water are perfect for washing down areas that are not covered or larger than 20 square meters.

Flush diverters ensure that wash water conforms to standards set by the water authority to not be liable for costly fines or shutdowns. They are durable, compact, and easy to maintain First flush diverters will ensure your operation is water authority-compliant for more than 20 years.

What are the flush diversion systems?

Systems for flush diversion are surprisingly complicated. This is how they function in a simple manner:

  • Rain falls on the building and is measured using the aid of a rain gauge.
  • Rainwater is directed to a treatment facility for wastewater until a maximum of 10mm is reached.
  • The diverter is closed, allowing extra rainwater to flow into storm water systems.
  • If the diverter is programmed, it may reactivate in the event of not enough rain or when a wash gun is turned on.

Applications and Uses

  • Clean up bays
  • Workshops
  • Re-fuelling zones
  • Construction sites
  • Transformer bunds
  • AQIS facilities
  • Hire equipment branches

The amount of water that needs to be diverted

The field experience and industry experience suggests that the volume of water to be diverted is determined based on (1) the area of the roof and (2) the number of contaminants that are present on the roof. The following elements can be used as a reference in determining the appropriate amount of water to divert. If the above guidelines can’t be followed, remember that diverting a portion in the beginning flush can be more beneficial than none! As a general rule, the more water is diverted, the better the quality of the water in the tank or cistern.

first flush diverter

Rain harvesting First Flushing Diverters are available in kits – you just need to put in your desired length of normal three”, 4″ or 12″ PVC pipe to make the diverter chamber. The length of the pipe will depend on the amount to be diverted. Diverters that have an open chamber that can be adjusted in the volume are superior to fixed-volume divers because the amount of water that is diverted can be tailored to the particular demands of every roof.

In-ground diverter

To be buried and removed from the site, In-Ground Diverters are ideal for sloped allotments. If you have a site with at least a 5′ slope, An In-Ground Diverter permits a “wet” system to change to a “dry” system. After the rain, when an In-Ground Diverter is set up, it will not only make the chamber of the diverter empty, but the water that is held in underground pipes will also be drained by the diverter, changing it into a “dry” system.


Check that you have the outlets of your diverters clean of any obstructions. When the outlet has been blocked, the chamber won’t be able to empty as the water that flows at the beginning that occurs when it rains won’t be diverted. Instead, it will flow towards the tank and cause water pollution. Installing a self-cleaning downspout filtration system like a leaf Eater(r) or Leaf Beater(r) in the vicinity of the Water Diverter will improve the performance of the diverter and dramatically reduce maintenance. Regularly loosen the End Cap of the water diverter to let debris fall out. The Hose or the Filter Screen when needed and then clean the Valve Control for Slow Release.

Legal Requirements

Numerous Local Authorities have created or are preparing guidelines for the construction tank for water storage on rainy days. In certain states of Australia, where rainwater is the only water source for more than three million people, it’s legal that downspout filters, first flush devices, and insect-proof screens are installed to capture rainwater to be stored in tanks.

Before installing a rainwater tank, or cistern, make sure to check to see if your Local Authority has such guidelines in place. It is essential to ensure that the system of the catchment is free of bacteria all the time to get high-quality water. Mosquitoes must be kept away from the pipe system and in the tank to avoid breeding and spreading diseases. Make sure that every plumbing job performed is in compliance with the rules. If you are unsure, seek the advice of a professional.

first flush diverter

Install the entire rain Harvesting system

In addition to the range of flush diverters, First Flush rainwater harvesting has developed an entire range of rainwater-related products. For example, suppose you’re thinking of purchasing the rainwater tank of your dreams. In that case, we suggest installing a complete system to enhance water quality and the capacity to catch and safeguard pumps and other household appliances and decrease tank maintenance.

Author: Laraib ChaudharyLaraib Chaudhary here, I am a passionate content writer and environmental expert. I have great experience of content writing. Through this, I have gained enough skills that will enable me to deliver high quality work to you.

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