First Flush and First Flush Diverters

 

Water quality from different roof catchments is a function of the type of roof material, climate conditions and surrounding environment. The quality of rainwater that can be collected also a function of roof texture. The particularly true of the roof is subject to the oxidising affects of sun and air borne pollutants (dust, birds' droppings, dirt and leaves).   

 

Water is First Flush?

When harvesting rainwater it is very important to keep the water clean and safe. Over time leaves, dirt, animal droppings, salt and other pollution builds up on your roof and gutters. Without a first flush system this will be washed off the roof and directly into your rainwater tanks causing the water to become dirty and possibly dangerous.

 

Sediment and pollution in the rainwater tank can also lead to:

* Damage to pumps, washing machines and other appliances;

* Blocked sprinklers;

* Excessive wear and shortened life on tap washers;

* Bacteria and algae growth in your rainwater tank.

 

 

 

 

Fitting an appropriately sized first flush diverter's chamber is critical to achieve good quality water. The amount of water you need to flush off is depended on the roof area. The recommended MINIMUM flush is 20L per 100m2 of roof catchment area. And if the amount of leaves and pollution on the roof is heavier than normal, we recommend that the flush amount should be approx 80-100 per 100m2 of roof.