Capture quality rainwater, right from the first drop.
Pre-Filtration
Every great Rain Harvesting™ system starts with pre-filtration. It is the work that happens between your roof and your tank, filtering out leaves and debris, diverting the first run of rainfall that carries the dirt and sediment from your roof, and giving water one last filter before it enters storage. The water that flows through is what reaches your tank, ready for whatever you need it for. Set up well, pre-filtration means quality water from day one, a tank that stays clear for longer, and a system that is genuinely easy to live with.
Where great rainwater begins.
What pre-filtration does
Pre-filtration happens in three main stages before the tank. First, leaves and debris are filtered out at the downpipe. Next, the initial run of rainfall, which picks up the dirt and sediment that has built up on your roof since the last rain, is diverted safely away. Finally, a tank screen sits at the inlet to filter what is left and stop insects and small animals from getting in. The rainfall that flows through all three stages is what reaches storage, ready to use.
A great start changes everything that follows.
Pre-filtration sets up the quality of the water you keep.
Why it matters
Filter leaves and debris at the downpipe
Rain heads
Rain heads sit at the top of your downpipe and filter out leaves and debris before they can block your pipes or enter your tank. Their mosquito-proof screens also keep pests out of any pipework that holds water.
Divert the first, dirtiest run of rainfall
First flush diverters
When rain starts, the first run of water carries the dust, sediment and contaminants that have built up on your roof. First flush diverters capture and hold that first flush so it is kept out of your tank, and only cleaner water carries through to storage.
A final filter at the tank inlet
Tank screens
A tank screen sits at the inlet and gives water one last filter as it enters, using 955 micron (0.955mm) stainless steel mesh to keep insects, vermin and remaining debris out. A solar shield underneath blocks sunlight to slow algae growth.
Why it matters
Rain heads
Rain heads sit at the top of your downpipe and filter out leaves and debris before they can block your pipes or enter your tank. Their mosquito-proof screens also keep pests out of any pipework that holds water.
Frequently asked questions
What is pre-filtration in a Rain Harvesting™ system?
Why should you filter rainwater before it enters the tank?
What's the difference between the main types of pre-filtration?
Should I use multiple stages of pre-filtration?
What's the journey of rainwater through a pre-filtration system?
Planning your system?
Set yourself up for great rainwater.
Whether you are starting from scratch or improving what you have, our team will help you choose the right pre-filtration for your roof, your downpipes and your rainfall. 35+ years of helping people collect quality rainwater.
The Handbook
The ultimate guide for help and inspiration to start your rainwater harvesting journey today.