John C Daley wrote:50 tons may be the weight of the tank, but not its volume.
The best way to settle and clean water us to have a large tank.
Filters etc are not needed if the tank is big.
350mm is low rainfall, how big is your family?
I would think about having thefirst flush be captured in another tank to be used in an orderly manner, with such low rainfall.
John C Daley wrote:Where did the 80 L figure come from ?
Do you have lots of dust, trees, bird poo?
Some diverts have spirals or cyclones so less water is dumped.