A first flush diverter also known as a roof washer is a simple contraption that diverts the first flow of water away from a rainwater catchment system.
Round copper gutter downspout rain barrel first flush diverter.
The first pass of water in any storm essentially washes your roof of all the sediments that have collected since the last rain.
Recommended first flush rain water diversion is at least a gallon of water per 100 square feet of rain collection area.
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Downpipe first flush diverters such as the 3 and 4 round kits are installed at each downpipe that supplies water to the tank.
The new first flush water diverter advanced allows less dirty water to skip over the first flush chamber.
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The tee incorporates a unique flow direction feature that forces fast flowing water into the diversion chamber preventing the water from entering your rainwater tank.
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Say you are using 4 inch round downspout pipe then you would need a 18 inch length of extension pipe per gallon while 6 inch downspout pipe only requires about 8 inches extension length to hold a gallon.