The First Flush Commercial’s size allows it to divert significantly larger volumes of the most contaminated water that washes off your roof. This makes it suitable for schools, hotels, warehouses and other sizeable commercial and non-commercial buildings. (Note: 225mm tee pictured)
By keeping the dirtiest water out of your tank, this first flush diverter provides significant protection to your rainwater quality. This water is often laden with hazardous contaminants such as bacteria, organic fine particles, heavy metals and other pollutants – so it pays to keep it out. (Note: 225mm end cap pictured)
The First Flush Commercial comes in an all-inclusive kit, including a stand (225mm). Simply add glue and a length of pipe that’s suitable for containing your desired diversion volume. Key components can be removed where necessary for easier maintenance. (Note: 225mm product pictured)
Generally speaking, the more water you divert, the better the quality of the rainwater that ends up in your tank. However, diverting more rainwater than necessary can lead to volume shortages, so it’s important to calculate your diversion needs, and divert water accordingly.
The following formulas offer general guidelines for calculating how much water you should divert:
This calculation will allow you to determine what length and size pipe or pipes you need for your diversion chambers.
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.
|Diversion chamber volume (litres)||Total length of 225mm pipe required (metres)|
It’s important to ensure that your first flush diverter outlet remains clear of any debris. If your outlet becomes blocked, the chamber will not empty and the first flush of water will not be diverted when it rains.
To ensure the flow of water out through your diverter’s outlet, periodically unscrew the outlet to allow debris to fall out. If the diversion chamber is full of water, take care as it empties. Remove the flow control washer, hose connector, keeper ring and filter screens and hose or wash the screens with clean water. Check the flow control washer for any blockages and remove and clean as necessary.
For best results and minimal maintenance, we recommend installing rain heads such as our Leaf Eater rain heads on all your downpipes to limit the volume and number of leaves and debris that reach your first flush diverter.
The exact components included in your first flush diverter kit will depend upon the product you order and are listed on each individual product page. (For product-specific information, visit the product page for your chosen first flush diverter via the links above.)
Your first flush diverter can be installed anywhere between your roof catchment area and your rainwater tank to isolate and capture the first “flush” of dirty water at the beginning of a rain event. You may choose to install smaller diverters to divert rainwater from each downpipe or you may choose to install larger diverters to divert rainwater from several downpipes.
In areas with mild pollution (e.g. open fields, no trees, no bird droppings or animal matter, clean environment) you should divert 0.5 litres per square metre of roof (0.0125 gallons per square foot of roof). In areas with higher pollution (e.g. leaves and debris, bird droppings, animal matter/carcases, pollution) you should divert 2 litres per square metre of roof (0.05 gallons per square foot of roof). These formulas will help you calculate your total diversion volume or, if you’re using more than one first flush diverter, the volume of water you should divert in each device (which will depend upon the size of the roof area that “feeds” each diverter).
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. For product-specific information, visit the support page for your first flush diverter.
1 metre of 90mm pipe = 5.7 litres
1 metre of 100mm pipe = 8.8 litres
1 metre of 150mm pipe = 18.8 litres
1 metre of 225mm pipe = 45 litres
1 metre of 300mm pipe = 72 litres
3 feet of 3″ pipe = 1.5 gallons
3 feet of 4″ pipe = 2 gallons
3 feet of 12″ pipe =19 gallons
Yes. Just remember that you need to size your first flush diversion chamber based on the size of the roof area that’s upstream from your diverter. If two or more pipes (aka lines) feed into a single diverter, you should size your diversion chamber accordingly by considering the total roof area that feeds both pipes.
Your first flush diverter comes with a range of flow control washers (valves). Each washer has a different sized hole. The size of the hole determines the rate at which your first flush diversion chamber will empty. A smaller hole will create a slower flow rate and release less water during a rain event, while a bigger hole will create a higher flow rate and release more water during a rain event. (Blockages excepted, any size washer will eventually fully empty your diversion chamber after each rain event.) Washers with a smaller hole will become blocked sooner than washers with a larger hole. Choosing your flow control washer is therefore a trade-off – lower wasted water during rainfall means more regular maintenance, while moderate wasted water during rainfall means less maintenance is required. However, when choosing your flow control washer, remember that the volume of water flowing from the largest washer, which has a 2mm diameter hole, will still be insignificant when compared to the rainfall flow rate.
Your diverter’s ball seat is like a funnel: \ /. The narrow end is installed facing down so it can be sealed by the black ball. (For detailed installation instructions, visit the Support page for your chosen first flush diverter.)
You can use 12mm irrigation tubing to plumb the trickle feed outlet to a location away from the diverter.
Slowly unscrew the black hose fitting from the bottom of your first flush diverter. If the diversion chamber is full of water, take care as the water empties. Remove the plastic filter (it may come out when you remove the black hose fitting) and wash under clean water. Check the flow control washer for any blockages and wash with clean water, then replace all these parts. (For product-specific maintenance instructions, visit the Support page for your chosen first flush diverter.)