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Frequently Asked Questions
What is rainwater actually used for?
Everything that need not be drinkable.
Lavatory flushing and washing machines.
Irrigation and outside taps.
Vehicle and site washing.
Which is a large share of consumption.
Why is so much of the system filtration?
Because roof water is dirty.
Leaves, moss, grit and droppings.
Plus whatever settled between showers.
And what enters the tank stays there.
So the effort goes upstream of it.
Why reject the first flush?
Because it is the dirtiest water.
It washes the roof clean.
Carrying everything that had settled.
Sending it to drain costs little.
And keeps the tank far cleaner.
How is the tank sized?
As a trade, not as a target.
Bigger bridges longer dry spells.
And costs more, and turns over slower.
Size it against how often backup runs.
Not against never needing it.
Why must there be an air gap?
So rainwater can never reach the mains.
Mains water falls through open air.
Into the rainwater side.
No back-siphonage can cross a gap.
And no failure can close it.
Could a valve do the same job?
No, and that is the point.
A valve can fail or be fitted wrongly.
A physical gap cannot do either.
The separation must be structural.
Not dependent on anything working.
Why is the pipework labelled?
So nobody mistakes it later.
For a drinking water supply.
Alterations happen years afterwards.
By people who were not there.
Marking is how they are told.