First Flush Water Diverter
Place the first flush water diverter at each downpipe to prevent the first flush of rainwater from entering your tank. It seals off the first flush chamber so that only clean water is diverted to the tank. Thus, improving the quality of your rainwater while protecting your water pumps and household appliances if you plan to pump rainwater from your water tank.

First Flush Water Diverter Benefits:

Improved Water Quality by reducing pollutants.
Protects your pump & internal appliances.
Reduces tank maintenance.
Empties itself of contaminated water & resets.

Read: How to install a first flush diverter