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First Flush Calculator

Calculate the volume of the 'first flush' of rain you need to divert away from your tank to maximize water quality.

Diverter Recommendation

To ensure high quality water enters your storage system, you should divert the first:

0 Gallons

Ensure your First Flush Diverter pipe/chamber can hold this capacity.

Filtration Stages

Proper filtration is multi-stage. It starts at the gutter and continues all the way into the home.

Leaf Eaters & Gutter Guards

The first line of defense. Prevents large debris, leaves, and twigs from entering the downspout and decaying in your system.

First Flush Diverters

Crucial for removing fine roof sediment, bird droppings, and accumulated dust from the initial rain washing the roof.

Mesh & UV Sterilization

Fine sediment filtration (5-1 micron) combined with Ultraviolet light is required if the water is to be used for indoor plumbing or potable uses.