There are 3 main reasons for having a First Flush Tank:
1. If you are building a large Rain Harvesting System with a 3000+ Square Foot Roof.
2. There is a lot of tree coverage hanging over your collection area.
3. If you plan on building a system to bring rainwater indoors for consumption.
If you think about the time that goes by in between rain storms, roofs can get dirty from dust blowing in the wind, various pollen from plants and trees, leafs, sticks, acorns, bird & squirrel droppings, etc. Rain Harvesting First Flush Tanks are installed to wash your roof top by collecting the first bit of dirty water coming off of your roof in your First Flush Tank. Once it’s been filled, the water coming off of your roof will be clean. With proper plumbing, the rainwater will bypass the First Flush Tank and flow into your primary storage tank(s).
Poly-Mart Rain Harvesting First Flush Tank - 100 Gallon - 4" Inlet

This 100 Gallon, 4 inch Inlet, rain harvesting first flush tank is essential for true rainwater harvesting. Poly-Mart is…

Manufacturer
Poly-Mart
Model
PM100FFHW4
Poly-Mart Rain Harvesting First Flush Tank - 125 Gallon - 4" Inlet

This 125 Gallon, 4 inch Inlet, rain harvesting first flush tank is essential for true rainwater harvesting. Poly-Mart is…

Manufacturer
Poly-Mart
Model
PM125FFHW4
Poly-Mart Rain Harvesting First Flush Tank - 150 Gallon - 4" Inlet

This 150 Gallon, 4 inch Inlet, rain harvesting first flush tank is essential for true rainwater harvesting. Poly-Mart is…

Manufacturer
Poly-Mart
Model
PM150FFHW4
Poly-Mart Rain Harvesting First Flush Tank - 200 Gallon - 4" Inlet

This 200 Gallon, 4 inch Inlet, rain harvesting first flush tank is essential for true rainwater harvesting. Poly-Mart is…

Manufacturer
Poly-Mart
Model
PM200FFHW4
Poly-Mart Rain Harvesting First Flush Tank - 250 Gallon - 4" Inlet

This 250 Gallon, 4 inch Inlet, rain harvesting first flush tank is essential for true rainwater harvesting. Poly-Mart is…

Manufacturer
Poly-Mart
Model
PM250FFHW4
Poly-Mart Rain Harvesting First Flush Tank - 500 Gallon - 4" Inlet

This 500 Gallon, 4 inch Inlet, rain harvesting first flush tank is essential for true rainwater harvesting. Poly-Mart is…

Manufacturer
Poly-Mart
Model
PM500FFHW4
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