First Flush Post/Wall w/ 300mm Chamber

A high volume first flush diverter, designed specifically for inground applications. Divert the dirtiest water and transform your Rain Harvesting system from “wet” to “dry” with this large volume inground first flush diverter.

This design uses large diameter, 300mm pipe to create the First Flush Diversion chamber - it's a straight forward design that's been trusted for years.

Divert contaminated water

Divert contaminated water

Prevents organic and inorganic fine particles from your roof entering your rainwater system.
It works automatically

It works automatically

Slow Release valve automatically drains your chamber over time so you are ready for the next rainfall event.
Divert Large volumes of water, easily

Divert Large volumes of water, easily

The large diameter pipe allows you to diverter move water, while using less space.
Just add pipe

Just add pipe

We include all fittings you need to set the system up. Just add the pipe to create the storage chamber.
SKU :
#002f6c
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First Flush Post/Wall w/ 300mm Chamber
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Benefits

Keep the dirtiest water out

By capturing and discarding the dirtiest, most contaminated water from your roof, this first flush diverter reduces the load on your pumps and filters and helps keep hazardous organic and inorganic matter out of your tank so your water remains fit-for-purpose.

Benefits

Install with ease

This versatile first flush diverter unit can manage water from single or multiple pipes. Wall, post and stand mounting options plus an all-parts-included kit mean installation couldn’t be easier. Simply add an appropriate length of pipe to divert as much as 150 litres as required.

Benefits

Divert large volumes of water, easily

By using large diameter 300mm pipe to create the first flush diversion chamber, you are able to diverter move water, while using less space.

Each meter of length in the diversion chamber will yield 72L diversion. We can help you calculate your first flush diversion needs using our online tool here.

Benefits

Keep the dirtiest water out

By capturing and discarding the dirtiest, most contaminated water from your roof, this first flush diverter reduces the load on your pumps and filters and helps keep hazardous organic and inorganic matter out of your tank so your water remains fit-for-purpose.

Benefits

Install with ease

This versatile first flush diverter unit can manage water from single or multiple pipes. Wall, post and stand mounting options plus an all-parts-included kit mean installation couldn’t be easier. Simply add an appropriate length of pipe to divert as much as 150 litres as required.

Benefits

Divert large volumes of water, easily

By using large diameter 300mm pipe to create the first flush diversion chamber, you are able to diverter move water, while using less space.

Each meter of length in the diversion chamber will yield 72L diversion. We can help you calculate your first flush diversion needs using our online tool here.

Product Installation, Maintenance and Information

Yes
Yes
Yes

Specifications

All measurements are in mm unless specified otherwise

Click the drawing to view it in full size

Pipe Fitment

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First Flush Calculator by Rain Harvesting

First Flush Calculator

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Free Handbooks by Rain Harvesting

Rain Harvesting Handbook

A guide that will provide you with help and inspiration to start your rainwater harvesting journey today.

A sketch of mechanics about rain harvesting

Design Service

Improve your existing Rain Harvesting system or design a new one with the help of our experts and our free system design service.