100mm First Flush Carrot Diverter Kit (Rain Harvesting)
Price $115.00 GST incl.
- Compact, chamber-free design – Minimal space, easy installation
- Automatic diversion – Diverts dirty water, then switches to clean collection
- Catch-All Tee technology – Prevents water bypass for maximum clean water yield
- Adjustable volume – Customize diversion from standard 20L/5 gal
- Medium catchment ideal – Perfect for low to moderate pollution areas
This kit fits 100mm downpipes. 90mm First Flush Carrot also available.
Discover the innovative First Flush Carrot, a compact, low-maintenance rainwater diverter, designed to keep dirty roof water away from your tank while taking up minimal space. Unlike traditional first flush chambers, the First Flush Carrot installs directly onto your downpipes and uses a clever system of grommets to measure water flow and automatically divert clean water to your tank. The device features “The Tee” – an anti-skipping, sloping design that ensures effective capture of dirty water. Best of all, it automatically resets after each rainfall event, giving you cleaner water with less hassle and maintenance.
This kit fits 100mm downpipes. 90mm First Flush Carrot also available.
Features & Benefits
- Compact, chamber-free design – Takes up minimal space and installs easily anywhere
- Automatic first flush diversion – Diverts dirty water then seamlessly switches to send clean water to your tank
- Catch-All Tee technology – Prevents water from skipping through until first flush is complete, maximizing clean water collection
- Adjustable diversion volume – Easily customise from the standard 20L/5 gal to suit your specific needs
- Perfect for medium catchments – Ideal for areas with low to moderate pollution levels
How the First Flush Carrot Works – Product Overview Video
What’s in the Box?
- Catch All Tee
- Carrot Housing
- Carrot Upper Collar with O-Ring
- Carrot Lower Slip Coupling
- Filling Grommets (A & B)
- Draining Grommets (0, 1, 2 & 3)
- Draining Wick with Frommet
- Carrot Spring
- Carrot Seal
- Carrot Flow Diffuser
- Carrot
- Carrot Filler Frame
How to Install Your First Flush Carrot
Installing your First Flush Carrot is straightforward with these basic steps:
- Choose your installation location (horizontal or vertical downpipe)
- Install the First Flush Plus T-junction with directional arrow pointing toward your tank
- Attach the upper collar
- Screw in the carrot housing with desired grommet settings
- Connect storm water outlet pipe below the carrot
The First Flush Carrot comes pre-configured with optimal settings for most rainfall conditions, making setup even easier. For detailed visual guidance and helpful tips to ensure proper installation, watch the complete step-by-step video tutorial below. You’ll see exactly how each component fits together and learn professional techniques for getting your rainwater harvesting system running smoothly!
For more information, please refer to the manufacturer First Flush Carrot Install and Specification Guide (PDF 5.7 MB).
How to use the First Flush Carrot Grommets
The First Flush Carrot comes with interchangeable grommets that allow you to customise your water diversion system for optimal performance. Here’s how they work:
Filling Grommets control water flow into the carrot:
- Grommet A (smaller hole) = diverts more water by filling slowly
- Grommet B (larger hole) = diverts less water by filling quickly
Draining Grommets control how fast water exits the carrot:
- Options 0-3 with progressively larger holes
- Larger holes = faster reset time and less maintenance
- A draining wick is also available for very low rainfall areas
The system comes pre-configured with Filling Grommet A and Draining Grommet 2 for balanced performance, but you can easily adjust both grommets to match your specific rainfall conditions and roof pollution levels.
Watch the video demonstration below to see exactly how to select and install the right grommet combination for your needs.
For complete step-by-step installation instructions, please refer to the detailed First Flush Carrot Install and Specification Guide (PDF 5.7 MB).
How to Maintain Your First Flush Carrot
It’s important to periodically unscrew the First Flush Carrot housing and check the unit is functioning properly. Check that both the Filling Grommet and Drainning Grommet have not become blocked. Also check that the spring is functioning correctly and all the internal seals are seated properly.
Watch the video demonstration below to see how to maintain your First Flush Carrot for cleaner rainwater.
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