Downspout First Flush Water Diverter Kits
Want cleaner cistern or rain barrel water?
First Flush Water Diverters improve water quality, reduce tank maintenance and
protect pumps by minimizing the first flush of water, which may contain
contaminants from the roof, from entering the tank.
Instead of flowing to the water tank, pollutants are diverted with the initial flow of
water into the chamber of the water diverter. The first flush water diverters utilize
a dependable ball and seat system - a simple automatic system that does not rely on
mechanical parts or manual intervention. As the water level rises in the diverter
chamber the ball floats, and once the chamber if full, the ball rests on a seat inside
the diverter chamber preventing any further water entering the diverter. The
subsequent flow of water is then automatically directed along the top of the
"T" to the collection tank.
There is an additional filter supplied with this First Flush Diverter Kit. It sits
inside of the standpipe. This mini filter helps keep the line open so that the water
in the standpipe may drain out slowly through the bottom. Yes, the speed at which the
water leaves the standpipe is adjustable with drip regulators. Attach a drip hose to
the bottom fitting and use this water too.
This chamber and filter will need to be cleaned. Unscrew the bottom fitting and
everything will fallout of the chamber, including the filter and plastic ball.
Carefully clean everything, put the green ball back inside the standpipe and screw
bottom fitting into place.
You will need to supply the 3, 4 or 12" diameter PVC standpipe; fittings from the
downspout to the First Flush Diverter; drain hose for the bottom drain; fitting from
the "T" of the First Flush Diverter to the to water containment unit.
Watch the general explanation video clip about First Flush Rain Harvesting Water Diverter Filter
Here is another great video with more detailed information
If you need to divert a large volume of water from entering the cistern,
review the page for
the larger 12" kit.
Planning a large underground cistern? You might consider this
In-Ground First Flush Diverter
Made in Australia by